iOS开发经验总结(二)

1、设置UILabel行间距

NSMutableAttributedString* attrString = [[NSMutableAttributedString alloc] initWithString:label.text];
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
[style setLineSpacing:20];
[attrString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, label.text.length)];
label.attributedText = attrString;

// 或者使用xib，看下gif图Untitled.gif

2、当使用-performSelector:withObject:withObject:afterDelay:方法时，需要传入多参数问题

// 方法一、
// 把参数放进一个数组／字典，直接把数组／字典当成一个参数传过去，具体方法实现的地方再解析这个数组／字典
NSArray * array =
[NSArray arrayWithObjects: @”first”, @”second”, nil];
[self performSelector:@selector(fooFirstInput:) withObject: array afterDelay:15.0];

// 方法二、
// 使用NSInvocation
SEL aSelector = NSSelectorFromString(@”doSoming:argument2:”);
NSInteger argument1 = 10;
NSString *argument2 = @”argument2”;
if([self respondsToSelector:aSelector]) {
NSInvocation *inv = [NSInvocation invocationWithMethodSignature:[self methodSignatureForSelector:aSelector]];
[inv setSelector:aSelector];
[inv setTarget:self];
[inv setArgument:&(argument1) atIndex:2];
[inv setArgument:&(argument2) atIndex:3];
[inv performSelector:@selector(invoke) withObject:nil afterDelay:15.0];
}

3、UILabel显示不同颜色字体

NSMutableAttributedString * string = [[NSMutableAttributedString alloc] initWithString:label.text];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,5)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(5,6)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(11,5)];
label.attributedText = string;

4、比较两个CGRect/CGSize/CGPoint是否相等

if (CGRectEqualToRect(rect1, rect2)) { // 两个区域相等
// do some
}
if (CGPointEqualToPoint(point1, point2)) { // 两个点相等
// do some
}
if (CGSizeEqualToSize(size1, size2)) { // 两个size相等
// do some
}

5、比较两个NSDate相差多少小时

NSDate* date1 = someDate;
NSDate* date2 = someOtherDate;
NSTimeInterval distanceBetweenDates = [date1 timeIntervalSinceDate:date2];
double secondsInAnHour = 3600;
// 除以3600是把秒化成小时，除以60得到结果为相差的分钟数
NSInteger hoursBetweenDates = distanceBetweenDates / secondsInAnHour;

6、每个cell之间增加间距

// 方法一，每个分区只显示一行cell，分区头当作你想要的间距(注意，从数据源数组中取值的时候需要用indexPath.section而不是indexPath.row)
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return yourArry.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 1;
}
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return cellSpacingHeight;
}

// 方法二，在cell的contentView上加个稍微低一点的view，cell上原本的内容放在你的view上，而不是contentView上，这样能伪造出一个间距来。

// 方法三，自定义cell，重写setFrame：方法
- (void)setFrame:(CGRect)frame
{
frame.size.height -= 20;
[super setFrame:frame];
}

7、播放一张张连续的图片

// 加入现在有三张图片分别为animate_1、animate_2、animate_3
// 方法一
imageView.animationImages = @[[UIImage imageNamed:@”animate_1”], [UIImage imageNamed:@”animate_2”], [UIImage imageNamed:@”animate_3”]];
imageView.animationDuration = 1.0;
// 方法二
imageView.image = [UIImage animatedImageNamed:@”animate_” duration:1.0];
// 方法二解释下，这个方法会加载animate_为前缀的，后边0-1024，也就是animate_0、animate_1一直到animate_1024

8、加载gif图片

推荐使用这个框架 FLAnimatedImage

9、防止离屏渲染为image添加圆角

// image分类
- (UIImage *)circleImage
{
// NO代表透明
UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);
// 获得上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
// 添加一个圆
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
// 方形变圆形
CGContextAddEllipseInRect(ctx, rect);
// 裁剪
CGContextClip(ctx);
// 将图片画上去
[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}

10、查看系统所有字体

// 打印字体
for (id familyName in [UIFont familyNames]) {
NSLog(@”%@”, familyName);
for (id fontName in [UIFont fontNamesForFamilyName:familyName]) NSLog(@” %@”, fontName);
}
// 也可以进入这个网址查看 http://iosfonts.com/

11、获取随机数

NSInteger i = arc4random();

12、获取随机数小数(0-1之间)

define ARC4RANDOM_MAX 0x100000000

double val = ((double)arc4random() / ARC4RANDOM_MAX);

13、AVPlayer视频播放完成的通知监听

[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(videoPlayEnd)
name:AVPlayerItemDidPlayToEndTimeNotification
object:nil];

14、判断两个rect是否有交叉

if (CGRectIntersectsRect(rect1, rect2)) {
}

15、判断一个字符串是否为数字

NSCharacterSet *notDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
if ([str rangeOfCharacterFromSet:notDigits].location == NSNotFound)
{
// 是数字
} else
{
// 不是数字
}

16、将一个view保存为pdf格式

• (void)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
  {
  NSMutableData *pdfData = [NSMutableData data];
  UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
  UIGraphicsBeginPDFPage();
  CGContextRef pdfContext = UIGraphicsGetCurrentContext();
  [aView.layer renderInContext:pdfContext];
  UIGraphicsEndPDFContext();

  NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);
  NSString* documentDirectory = [documentDirectories objectAtIndex:0];
  NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];
  [pdfData writeToFile:documentDirectoryFilename atomically:YES];
  NSLog(@”documentDirectoryFileName: %@”,documentDirectoryFilename);
  }

17、让一个view在父视图中心

child.center = [parent convertPoint:parent.center fromView:parent.superview];

18、获取当前导航控制器下前一个控制器

• (UIViewController *)backViewController
  {
  NSInteger myIndex = [self.navigationController.viewControllers indexOfObject:self];

  if ( myIndex != 0 && myIndex != NSNotFound ) {
  return [self.navigationController.viewControllers objectAtIndex:myIndex-1];
  } else {
  return nil;
  }
  }

19、保存UIImage到本地

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@”Image.png”];

[UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES];

20、键盘上方增加工具栏

UIToolbar *keyboardDoneButtonView = [[UIToolbar alloc] init];
[keyboardDoneButtonView sizeToFit];
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@”Done”
style:UIBarButtonItemStyleBordered target:self
action:@selector(doneClicked:)];
[keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]];
txtField.inputAccessoryView = keyboardDoneButtonView;

21、copy一个view

因为UIView没有实现copy协议，因此找不到copyWithZone方法，使用copy的时候导致崩溃但是我们可以通过归档再解档实现copy，这相当于对视图进行了一次深拷贝，代码如下

id copyOfView =
[NSKeyedUnarchiver unarchiveObjectWithData:[NSKeyedArchiver archivedDataWithRootObject:originalView]];

22、在image上绘制文字并生成新的image

UIFont *font = [UIFont boldSystemFontOfSize:12];
UIGraphicsBeginImageContext(image.size);
[image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)];
CGRect rect = CGRectMake(point.x, point.y, image.size.width, image.size.height);
[[UIColor whiteColor] set];
[text drawInRect:CGRectIntegral(rect) withFont:font];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

23、判断一个view是否为另一个view的子视图

// 如果myView是self.view本身，也会返回yes
BOOL isSubView = [myView isDescendantOfView:self.view];

24、判断一个字符串是否包含另一个字符串

// 方法一、这种方法只适用于iOS8之后，如果是配iOS8之前用方法二
if ([str containsString:otherStr]) NSLog(@”包含”);

// 方法二
NSRange range = [str rangeOfString:otherStr];
if (range.location != NSNotFound) NSLog(@”包含”);

25、UICollectionView自动滚动到某行

// 重写viewDidLayoutSubviews方法
-(void)viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
[self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionCenteredVertically animated:NO];
}

26、修改系统UIAlertController

// 但是据说这种方法会被App Store拒绝(慎用！)
UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@”” message:@”” preferredStyle:UIAlertControllerStyleActionSheet];
NSMutableAttributedString *hogan = [[NSMutableAttributedString alloc] initWithString:@”我是一个大文本”];
[hogan addAttribute:NSFontAttributeName
value:[UIFont systemFontOfSize:30]
range:NSMakeRange(4, 1)];
[hogan addAttribute:NSForegroundColorAttributeName
value:[UIColor redColor]
range:NSMakeRange(4, 1)];
[alertVC setValue:hogan forKey:@”attributedTitle”];

UIAlertAction *button = [UIAlertAction actionWithTitle:@"Label text" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){ }];UIImage *accessoryImage = [UIImage imageNamed:@"1"];[button setValue:accessoryImage forKey:@"image"];[alertVC addAction:button];[self presentViewController:alertVC animated:YES completion:nil];

27、判断某一行的cell是否已经显示

CGRect cellRect = [tableView rectForRowAtIndexPath:indexPath];
BOOL completelyVisible = CGRectContainsRect(tableView.bounds, cellRect);

28、让导航控制器pop回指定的控制器

NSMutableArray *allViewControllers = [NSMutableArray arrayWithArray:[self.navigationController viewControllers]];
for (UIViewController *aViewController in allViewControllers) {
if ([aViewController isKindOfClass:[RequiredViewController class]]) {
[self.navigationController popToViewController:aViewController animated:NO];
}
}

29、动画修改label上的文字

// 方法一
CATransition *animation = [CATransition animation];
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animation.type = kCATransitionFade;
animation.duration = 0.75;
[self.label.layer addAnimation:animation forKey:@”kCATransitionFade”];
self.label.text = @”New”;

// 方法二
[UIView transitionWithView:self.label
duration:0.25f
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{

                    self.label.text = @"Well done!";                } completion:nil];

// 方法三
[UIView animateWithDuration:1.0
animations:^{
self.label.alpha = 0.0f;
self.label.text = @”newText”;
self.label.alpha = 1.0f;
}];

30、判断字典中是否包含某个key值

if ([dic objectForKey:@”yourKey”]) {
NSLog(@”有这个值”);
} else {
NSLog(@”没有这个值”);
}

31、获取屏幕方向

UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;

if(orientation == 0) //Default orientation
//默认
else if(orientation == UIInterfaceOrientationPortrait)
//竖屏
else if(orientation == UIInterfaceOrientationLandscapeLeft)
// 左横屏
else if(orientation == UIInterfaceOrientationLandscapeRight)
//右横屏

32、设置UIImage的透明度

// 方法一、添加UIImage分类
- (UIImage *)imageByApplyingAlpha:(CGFloat) alpha {
UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);

CGContextRef ctx = UIGraphicsGetCurrentContext();CGRect area = CGRectMake(0, 0, self.size.width, self.size.height);CGContextScaleCTM(ctx, 1, -1);CGContextTranslateCTM(ctx, 0, -area.size.height);CGContextSetBlendMode(ctx, kCGBlendModeMultiply);CGContextSetAlpha(ctx, alpha);CGContextDrawImage(ctx, area, self.CGImage);UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return newImage;

}

// 方法二、如果没有奇葩需求，干脆用UIImageView设置透明度
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageWithName:@”yourImage”]];
imageView.alpha = 0.5;

33、Attempt to mutate immutable object with insertString:atIndex:

这个错是因为你拿字符串调用insertString:atIndex:方法的时候，调用对象不是NSMutableString，应该先转成这个类型再调用

34、UIWebView添加单击手势不响应

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(webViewClick)];
tap.delegate = self;
[_webView addGestureRecognizer:tap];

// 因为webView本身有一个单击手势，所以再添加会造成手势冲突，从而不响应。需要绑定手势代理，并实现下边的代理方法
- (BOOL)gestureRecognizer:(UIGestureRecognizer )gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer )otherGestureRecognizer{
return YES;
}

35、获取手机RAM容量

// 需要导入#import

pragma clang diagnostic ignored “-Wdeprecated-declarations”**

    decoded = [[self alloc] initWithBase64Encoding:[string stringByReplacingOccurrencesOfString:@"[^A-Za-z0-9+/=]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [string length])]];

#pragma clang diagnostic pop
}
else
#endif
{
decoded = [[self alloc] initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters];
}
return [decoded length]? decoded: nil;
}
/**
* @brief NSData转string
* @param wrapWidth 换行长度 76 64
*/
- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth
{
if (![self length]) return nil;
NSString *encoded = nil;
#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0
if (![NSData instancesRespondToSelector:@selector(base64EncodedStringWithOptions:)])
{
**#pragma clang diagnostic push

pragma clang diagnostic ignored “-Wdeprecated-declarations”**

    encoded = [self base64Encoding];

#pragma clang diagnostic pop

}else

#endif
{
switch (wrapWidth)
{
case 64:
{
return [self base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}
case 76:
{
return [self base64EncodedStringWithOptions:NSDataBase64Encoding76CharacterLineLength];
}
default:
{
encoded = [self base64EncodedStringWithOptions:(NSDataBase64EncodingOptions)0];
}
}
}
if (!wrapWidth || wrapWidth >= [encoded length])
{
return encoded;
}
wrapWidth = (wrapWidth / 4) * 4;
NSMutableString *result = [NSMutableString string];
for (NSUInteger i = 0; i < [encoded length]; i+= wrapWidth)
{
if (i + wrapWidth >= [encoded length])
{
[result appendString:[encoded substringFromIndex:i]];
break;
}
[result appendString:[encoded substringWithRange:NSMakeRange(i, wrapWidth)]];
[result appendString:@”\r\n”];
}
return result;
}
/**
* @brief NSData转string 换行长度默认64
*/
- (NSString *)base64EncodedString
{
return [self base64EncodedStringWithWrapWidth:0];
}

63、AES加密

#import

import “CALayer+BorderColor.h”

@implementation CALayer (BorderColor)

• (void)setBorderUIColor:(UIColor *)color
  {
  self.borderColor = color.CGColor;
  }

76、根据经纬度获取城市等信息

// 创建经纬度
CLLocation *location = [[CLLocation alloc] initWithLatitude:latitude longitude:longitude];
//创建一个译码器
CLGeocoder *cLGeocoder = [[CLGeocoder alloc] init];
[cLGeocoder reverseGeocodeLocation:userLocation completionHandler:^(NSArray *placemarks, NSError *error) {
CLPlacemark *place = [placemarks objectAtIndex:0];
// 位置名
　　NSLog(@”name,%@”,place.name);
　　// 街道
　　NSLog(@”thoroughfare,%@”,place.thoroughfare);
　　// 子街道
　　NSLog(@”subThoroughfare,%@”,place.subThoroughfare);
　　// 市
　　NSLog(@”locality,%@”,place.locality);
　　// 区
　　NSLog(@”subLocality,%@”,place.subLocality);
　　// 国家
　　NSLog(@”country,%@”,place.country);
}
}];

/* CLPlacemark中属性含义
name 地名

thoroughfare 街道

subThoroughfare 街道相关信息，例如门牌等

locality 城市

subLocality 城市相关信息，例如标志性建筑

administrativeArea 直辖市

subAdministrativeArea 其他行政区域信息（自治区等）

postalCode 邮编

ISOcountryCode 国家编码

country 国家

inlandWater 水源，湖泊

ocean 海洋

areasOfInterest 关联的或利益相关的地标
*/

77、如何防止添加多个NSNotification观察者？

// 解决方案就是添加观察者之前先移除下这个观察者
[[NSNotificationCenter defaultCenter] removeObserver:observer name:name object:object];
[[NSNotificationCenter defaultCenter] addObserver:observer selector:selector name:name object:object];

78、将一个xib添加到另外一个xib上

// 假设你的自定义view名字为CustomView，你需要在CustomView.m中重写 - (instancetype)initWithCoder:(NSCoder *)aDecoder 方法，代码如下：
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if ((self = [super initWithCoder:aDecoder])) {
[self addSubview:[[[NSBundle mainBundle] loadNibNamed:@”CustomView” owner:self options:nil] objectAtIndex:0]];
}
return self;
}

将一个xib添加到另外一个xib上.png
79、处理字符串，使其首字母大写

NSString *str = @"abcdefghijklmn";NSString *resultStr;if (str && str.length > 0) {    resultStr = [str stringByReplacingCharactersInRange:NSMakeRange(0,1) withString:[[str substringToIndex:1] capitalizedString]];}NSLog(@"%@", resultStr);

80、判断一个UIAlertView/UIAlertController是否显示

// UIAlertView自带属性
if (alert.visible)
{
NSLog(@”显示了”);
} else {
NSLog(@”未显示”);
}

// UIAlertController没有visible属性，需要自己判断，添加一个全局变量 BOOL visible
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@”Title” message:@”message” preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction alertAction = [UIAlertAction actionWithTitle:@”ActionTitle” style:UIAlertActionStyleDefault handler:^(UIAlertAction _Nonnull action) {
self.visible = NO;
}];
UIAlertAction calcelAction = [UIAlertAction actionWithTitle:@”calcelTitle” style:UIAlertActionStyleCancel handler:^(UIAlertAction _Nonnull action) {
self.visible = NO;
}];
[alertController addAction:alertAction];
[alertController addAction:calcelAction];
[self presentViewController:alertController animated:YES completion:^{
self.visible = YES;
}];

81、获取字符串中的数字

• (NSString )getNumberFromStr:(NSString )str
  {
  NSCharacterSet *nonDigitCharacterSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
  return [[str componentsSeparatedByCharactersInSet:nonDigitCharacterSet] componentsJoinedByString:@”“];
  }

  NSLog(@”%@”, [self getNumberFromStr:@”a0b0c1d2e3f4fda8fa8fad9fsad23”]); // 00123488923

82、为UIView的某个方向添加边框

// 添加UIView分类

// UIView+WZB.h

import

import “UIView+WZB.h”

@implementation UIView (WZB)

• (void)wzb_addBorder:(WZBBorderDirectionType)direction color:(UIColor *)color width:(CGFloat)width
  {
  CALayer *border = [CALayer layer];
  border.backgroundColor = color.CGColor;
  switch (direction) {
  case WZBBorderDirectionTop:
  {
  border.frame = CGRectMake(0.0f, 0.0f, self.bounds.size.width, width);
  }
  break;
  case WZBBorderDirectionLeft:
  {
  border.frame = CGRectMake(0.0f, 0.0f, width, self.bounds.size.height);
  }
  break;
  case WZBBorderDirectionBottom:
  {
  border.frame = CGRectMake(0.0f, self.bounds.size.height - width, self.bounds.size.width, width);
  }
  break;
  case WZBBorderDirectionRight:
  {
  border.frame = CGRectMake(self.bounds.size.width - width, 0, width, self.bounds.size.height);
  }
  break;

  default:    break;

  }
  [self.layer addSublayer:border];
  }

83、通过属性设置UISwitch、UIProgressView等控件的宽高

mySwitch.transform = CGAffineTransformMakeScale(5.0f, 5.0f);

progressView.transform = CGAffineTransformMakeScale(5.0f, 5.0f);

84、自动搜索功能，用户连续输入的时候不搜索，用户停止输入的时候自动搜索(我这里设置的是0.5s，可根据需求更改)

// 输入框文字改变的时候调用
-(void)searchBar:(UISearchBar )searchBar textDidChange:(NSString )searchText{
// 先取消调用搜索方法
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(searchNewResult) object:nil];
// 0.5秒后调用搜索方法
[self performSelector:@selector(searchNewResult) withObject:nil afterDelay:0.5];
}

85、修改UISearchBar的占位文字颜色

// 方法一（推荐使用）UITextField *searchField = [searchBar valueForKey:@"_searchField"];[searchField setValue:[UIColor blueColor] forKeyPath:@"_placeholderLabel.textColor"];// 方法二（已过期）[[UILabel appearanceWhenContainedIn:[UISearchBar class], nil] setTextColor:[UIColor redColor]];// 方法三（已过期）NSDictionary *placeholderAttributes = @{NSForegroundColorAttributeName : [UIColor redColor], NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue" size:15],};NSAttributedString *attributedPlaceholder = [[NSAttributedString alloc] initWithString:searchBar.placeholder attributes:placeholderAttributes];[[UITextField appearanceWhenContainedIn:[UISearchBar class], nil] setAttributedPlaceholder:attributedPlaceholder];

86、某个界面多个事件同时响应引起的问题(比如，两个button同时按push到新界面，两个都会响应，可能导致push重叠)

// UIView有个属性叫做exclusiveTouch，设置为YES后，其响应事件会和其他view互斥(有其他view事件响应的时候点击它不起作用)
view.exclusiveTouch = YES;

// 一个一个设置太麻烦了，可以全局设置
[[UIView appearance] setExclusiveTouch:YES];

// 或者只设置button
[[UIButton appearance] setExclusiveTouch:YES];

87、修改tabBar的frame

// 子类化UITabBarViewController，我这里以修改tabBar高度为例，重写viewWillLayoutSubviews方法

import “WZBTabBarViewController.h”

@interface WZBTabBarViewController ()

@end

@implementation WZBTabBarViewController
- (void)viewWillLayoutSubviews {

CGRect tabFrame = self.tabBar.frame;tabFrame.size.height = 100;tabFrame.origin.y = self.view.frame.size.height - 100;self.tabBar.frame = tabFrame;

}
@end

88、修改键盘背景颜色

// 设置某个键盘颜色
textField.keyboardAppearance = UIKeyboardAppearanceAlert;

// 设置工程中所有键盘颜色
[[UITextField appearance] setKeyboardAppearance:UIKeyboardAppearanceAlert];

89、修改image颜色

UIImage *image = [UIImage imageNamed:@”test”];
imageView.image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextClipToMask(context, rect, image.CGImage);
CGContextSetFillColorWithColor(context, [[UIColor redColor] CGColor]);
CGContextFillRect(context, rect);
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIImage *flippedImage = [UIImage imageWithCGImage:img.CGImage scale:1.0 orientation: UIImageOrientationDownMirrored];imageView.image = flippedImage;

90、动画执行removeFromSuperview

[UIView animateWithDuration:0.2                 animations:^{                     view.alpha = 0.0f;                 } completion:^(BOOL finished){                     [view removeFromSuperview];                 }];

91、设置UIButton高亮背景颜色

[UIView animateWithDuration:0.2                 animations:^{                     view.alpha = 0.0f;                 } completion:^(BOOL finished){                     [view removeFromSuperview];                 }];

92、设置UIButton高亮时的背景颜色

// 方法一、子类化UIButton，重写setHighlighted:方法，代码如下

import “WZBButton.h”

@implementation WZBButton

• (void)setHighlighted:(BOOL)highlighted {
  [super setHighlighted:highlighted];

  UIColor *normalColor = [UIColor greenColor];
  UIColor *highlightedColor = [UIColor redColor];
  self.backgroundColor = highlighted ? highlightedColor : normalColor;

}

// 方法二、利用setBackgroundImage:forState:方法
[button setBackgroundImage:[self imageWithColor:[UIColor blueColor]] forState:UIControlStateHighlighted];

• (UIImage )imageWithColor:(UIColor )color {
  CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
  UIGraphicsBeginImageContext(rect.size);
  CGContextRef context = UIGraphicsGetCurrentContext();

  CGContextSetFillColorWithColor(context, [color CGColor]);
  CGContextFillRect(context, rect);

  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();

  return image;
  }

93、关于图片拉伸

推荐看这个博客，讲的很详细http://blog.csdn.net/q199109106q/article/details/8615661

94、利用runtime获取一个类所有属性

• (NSArray *)allPropertyNames:(Class)aClass
  {
  unsigned count;
  objc_property_t *properties = class_copyPropertyList(aClass, &count);

  NSMutableArray *rv = [NSMutableArray array];

  unsigned i;
  for (i = 0; i < count; i++)
  {
  objc_property_t property = properties[i];
  NSString *name = [NSString stringWithUTF8String:property_getName(property)];
  [rv addObject:name];
  }

  free(properties);

  return rv;
  }

95、设置textView的某段文字变成其他颜色

• (void)setupTextView:(UITextView )textView text:(NSString )text color:(UIColor *)color {
  NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:textView.text];
  [string addAttribute:NSForegroundColorAttributeName value:color range:[textView.text rangeOfString:text]];
  [textView setAttributedText:string];
  }

96、让push跳转动画像modal跳转动画那样效果(从下往上推上来)

• (void)push
  {
  TestViewController *vc = [[TestViewController alloc] init];
  vc.view.backgroundColor = [UIColor redColor];
  CATransition* transition = [CATransition animation];
  transition.duration = 0.4f;
  transition.type = kCATransitionMoveIn;
  transition.subtype = kCATransitionFromTop;
  [self.navigationController.view.layer addAnimation:transition forKey:kCATransition];
  [self.navigationController pushViewController:vc animated:NO];
  }

• (void)pop
  {
  CATransition* transition = [CATransition animation];
  transition.duration = 0.4f;
  transition.type = kCATransitionReveal;
  transition.subtype = kCATransitionFromBottom;
  [self.navigationController.view.layer addAnimation:transition forKey:kCATransition];
  [self.navigationController popViewControllerAnimated:NO];
  }

97、上传图片太大，压缩图片

-(UIImage )resizeImage:(UIImage )image
{
float actualHeight = image.size.height;
float actualWidth = image.size.width;
float maxHeight = 300.0;
float maxWidth = 400.0;
float imgRatio = actualWidth/actualHeight;
float maxRatio = maxWidth/maxHeight;
float compressionQuality = 0.5;//50 percent compression

if (actualHeight > maxHeight || actualWidth > maxWidth){    if(imgRatio < maxRatio)    {        //adjust width according to maxHeight        imgRatio = maxHeight / actualHeight;        actualWidth = imgRatio * actualWidth;        actualHeight = maxHeight;    }    else if(imgRatio > maxRatio)    {        //adjust height according to maxWidth        imgRatio = maxWidth / actualWidth;        actualHeight = imgRatio * actualHeight;        actualWidth = maxWidth;    }    else    {        actualHeight = maxHeight;        actualWidth = maxWidth;    }}CGRect rect = CGRectMake(0.0, 0.0, actualWidth, actualHeight);UIGraphicsBeginImageContext(rect.size);[image drawInRect:rect];UIImage *img = UIGraphicsGetImageFromCurrentImageContext();NSData *imageData = UIImageJPEGRepresentation(img, compressionQuality);UIGraphicsEndImageContext();return [UIImage imageWithData:imageData];

}

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链接：http://www.jianshu.com/p/9fcd37c0ea05
來源：简书
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