乱七八糟的什么都有，初学时的一点笔记类的东西

Graphics简单应用

UIImage *btnImage  =[HeadPortraitImage setHeadPortraitImage];    CGFloat width = btnImage.size.width;    CGFloat height = btnImage.size.height;    //开始绘制图片    UIGraphicsBeginImageContext(btnImage.size);    CGContextRef gc = UIGraphicsGetCurrentContext();    ////绘制Clip区域    CGContextAddEllipseInRect(gc, CGRectMake(0, 0,60, 60)); //圆    CGContextClosePath(gc);    CGContextClip(gc);    //坐标系转换    //因为CGContextDrawImage会使用Quartz内的以左下角为(0,0)的坐标系    CGContextTranslateCTM(gc, 0, height);    CGContextScaleCTM(gc, 1, -1);    CGContextDrawImage(gc, CGRectMake(0, 0, width, height), [btnImage CGImage]);    //结束绘画    UIImage *destImg = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    [self.userHeadBTN setImage:destImg forState:UIControlStateNormal];



Label根据字符串长度自动适应宽度和高度

//这个frame是初设的，没关系，后面还会重新设置其size。    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0,0,0,0)];    label.numberOfLines = 0;    label.backgroundColor = [UIColor clearColor];    NSDictionary *attributes = @{NSFontAttributeName:[UIFont systemFontOfSize:20],};    NSString *str = @"就是这一段难伺候的字符串，不知道长度，所以才要让控件自适应";    CGSize textSize = [str boundingRectWithSize:CGSizeMake(100, 100) options:NSStringDrawingTruncatesLastVisibleLine attributes:attributes context:nil].size;;    [label setFrame:CGRectMake(100, 100, textSize.width, textSize.height)];    label.textColor = [UIColor greenColor];    label.text = str;    [self.view addSubview:label];

关于字符串的一些东西，有些东西可能很少用吧

/*----------------写字符串到文件:writeToFile方法----------------*/    NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];NSLog(@"astring:%@",astring);NSString *path = @"astring.text";    [astring writeToFile: path atomically: YES];[astring release];    /*----------------比较两个字符串----------------*/        //用C比较:strcmp函数char string1[] = "string!";char string2[] = "string!";if(strcmp(string1, string2) = = 0){    NSLog(@"1");}//compare方法(comparer返回的三种值)    NSString *astring01 = @"This is a String!";NSString *astring02 = @"This is a String!";    BOOL result = [astring01 compare:astring02] = = NSOrderedSame;    NSLog(@"result:%d",result);    //NSOrderedSame判断两者内容是否相同NSString *astring01 = @"This is a String!";NSString *astring02 = @"this is a String!";BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;    NSLog(@"result:%d",result);//NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)NSString *astring01 = @"this is a String!";NSString *astring02 = @"This is a String!";BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;    NSLog(@"result:%d",result);     //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)//不考虑大小写比较字符串1NSString *astring01 = @"this is a String!";NSString *astring02 = @"This is a String!";BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;    NSLog(@"result:%d",result);     //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)//不考虑大小写比较字符串2NSString *astring01 = @"this is a String!";NSString *astring02 = @"This is a String!";BOOL result = [astring01 compare:astring02                        options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedSame;    NSLog(@"result:%d",result);     //NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写 NSNumericSearch:比较字符串的字符个数，而不是字符值。/*----------------改变字符串的大小写----------------*/    NSString *string1 = @"A String"; NSString *string2 = @"String"; NSLog(@"string1:%@",[string1 uppercaseString]);//大写NSLog(@"string2:%@",[string2 lowercaseString]);//小写NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小/*----------------在串中搜索子串----------------*/        NSString *string1 = @"This is a string";NSString *string2 = @"string";NSRange range = [string1 rangeOfString:string2];int location = range.location;int leight = range.length;NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%i,Leight:%i",location,leight]];NSLog(@"astring:%@",astring);[astring release];/*----------------抽取子串 ----------------*/        //-substringToIndex: 从字符串的开头一直截取到指定的位置，但不包括该位置的字符NSString *string1 = @"This is a string";NSString *string2 = [string1 substringToIndex:3];NSLog(@"string2:%@",string2);//-substringFromIndex: 以指定位置开始（包括指定位置的字符），并包括之后的全部字符NSString *string1 = @"This is a string";NSString *string2 = [string1 substringFromIndex:3];NSLog(@"string2:%@",string2);//-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串NSString *string1 = @"This is a string";NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];NSLog(@"string2:%@",string2);//扩展路径NSString *Path = @"~/NSData.txt";NSString *absolutePath = [Path stringByExpandingTildeInPath];NSLog(@"absolutePath:%@",absolutePath);NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);//文件扩展名NSString *Path = @"~/NSData.txt";NSLog(@"Extension:%@",[Path pathExtension]);/*---------------给字符串分配容量----------------*///stringWithCapacity:NSMutableString *String;//其实很多类都有这个方法，WithCapacity都是置顶容量进行初始化（申请内存）String = [NSMutableString stringWithCapacity:40];/*---------------在已有字符串后面添加字符----------------*/    //appendString: and appendFormat:NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];//[String1 appendString:@", I will be adding some character"];[String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];/*--------按照所给出的范围，和字符串替换的原有的字符------*///-setString:NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];[String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];NSLog(@"String1:%@",String1);/*-------------判断字符串内是否还包含别的字符串(前缀，后缀)-------------*///01：检查字符串是否以另一个字符串开头- (BOOL) hasPrefix: (NSString *) aString;NSString *String1 = @"NSStringInformation.txt";[String1 hasPrefix:@"NSString"] = = 1 ?  NSLog(@"YES") : NSLog(@"NO");[String1 hasSuffix:@".txt"] = = 1 ?  NSLog(@"YES") : NSLog(@"NO");//02：查找字符串某处是否包含其它字符串 - (NSRange) rangeOfString: (NSString *) aString，这一点前面在串中搜索子串用到过;




Json转字典
+ (NSDictionary )dictionaryWithJsonString:(NSString )jsonString {
if (jsonString == nil) {
return nil;
}
NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSError *err;
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData
options:NSJSONReadingMutableContainers
error:&err];
if(err) {
NSLog(@”json解析失败：%@”,err);
return nil;
}
return dic;
}


字典转Json
+ (NSString*)dictionaryToJson:(NSDictionary *)dic
{
NSError *parseError = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&parseError];
return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}

监测网络状态
- (BOOL)application:(UIApplication )application didFinishLaunchingWithOptions:(NSDictionary )launchOptions {
//添加一个系统通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];
//初始化
self.internetReachability=[Reachability reachabilityForInternetConnection];
//通知添加到Run Loop
[self.internetReachability startNotifier];
[self updateInterfaceWithReachability:_internetReachability];
return YES;
}
回调函数:
- (void) reachabilityChanged:(NSNotification *)note
{
Reachability* curReach = [note object];
NSParameterAssert([curReach isKindOfClass:[Reachability class]]);
[self updateInterfaceWithReachability:curReach];
}
- (void)updateInterfaceWithReachability:(Reachability *)reachability
{
NetworkStatus netStatus = [reachability currentReachabilityStatus];
switch (netStatus) {
case NotReachable:
NSLog(@”====当前网络状态不可达=======http://www.cnblogs.com/xiaofeixiang“);
break;
case ReachableViaWiFi:
NSLog(@”====当前网络状态为Wifi=======博客园-Fly_Elephant”);
break;
case ReachableViaWWAN:
NSLog(@”====当前网络状态为3G=======keso”);
break;
}
}

self.navigationController.navigationBar.translucent = NO;

//collectionView内的item不足一屏的时候默认不滚蛋，这句话可设置
collectionView.allowSelection = NO;

改变子视图的层级
- (void)bringSubviewToFront:(UIView *)view;//置顶
- (void)sendSubviewToBack…//置底

视图控制器的指定初始化方法,无论调用哪个方法,改初始化方法都会被触发;
-(instancetype)initWithNibName:(NSString )nibNameOrNil bundle:(NSBundle )nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
//完成本类独有的初始化操作.
}
return self;
}

APPdelegate内：
//也可以让APP在后台活得久一点
- (BOOL)application:(UIApplication )application didFinishLaunchingWithOptions:(NSDictionary )launchOptions {

// 注册后台播放AVAudioSession *session = [AVAudioSession sharedInstance];[session setCategory:AVAudioSessionCategoryPlayback error:NULL];// 开启远程事件  -->自动切歌[application beginReceivingRemoteControlEvents];return YES;

}

UITextView和UILabel加载HTML：http://www.henishuo.com/uitextview-uilabel-load-html/

iOS中高级笔试题二：http://www.henishuo.com/ios-middle-hight-interview-two/

xcode7安装Alcatraz插件管理器：http://www.henishuo.com/ios-alcatraz-unavaiable/

UITextView在光标处插入字符串：http://www.henishuo.com/uitextview-cursor-insert-string/

hitTest:withEvent:方法流程：http://www.cnblogs.com/klaus/archive/2013/04/22/3036692.html

触摸事件UITouch的用法 ： http://blog.csdn.net/enuola/article/details/8291402

xml\json解析：http://www.jianshu.com/p/a54d367adb2a

block回调：http://blog.csdn.net/itpeng523/article/details/24315541

监听程序是否被挂起：http://blog.csdn.net/sqc3375177/article/details/9466687

摄像头和相册：http://blog.sina.com.cn/s/blog_7b9d64af0101cfd9.html

简单排序：http://blog.sina.com.cn/s/blog_4cd8dd130102v7e4.html

图文混排：http://blog.csdn.net/zengraoli/article/details/12615993

imageSize：https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/IconMatrix.html

layer： http://www.cnblogs.com/wendingding/p/3800010.html

上拉下拉刷新： https://github.com/CoderMJLee/MJRefresh

菜鸟教程：http://www.runoob.com

realm ios oc使用.

self.collectionView.alwaysBounceVertical = YES;
当界面内容不超过界面大小时不会滑动，加上面这句话就能滑动了

table去除多余cell
TableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];

• (void)scrollToRowAtIndexPath:(NSIndexPath *)indexPath atScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated。滑动到最后一行，或者用scrollview的setContentOffset滚动到最后。
  [tableView scrollToNearestSelectedRowAtScrollPosition:UITableViewScrollPositionBottom animated:YES];
  这个是选择哪一行的cell，让该行的cell滑到tableView的最底端
  NSIndexPath *indexPath = [NSIndexPath indexPathForItem:13 inSection:0];
  [tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
  这个是指定哪一行的cell，让该行cell滑到tableView的最底端 ！

通过Edge隐藏第一行cell分割线 让他左距屏幕那么宽，右为0，然后就可以隐藏了
if (indexPath.row == 0) {
[cell setSeparatorInset:UIEdgeInsetsMake(0, WidthSize, 0, 0)];
}

核心动画的极简应用
CATransition *animation = [CATransition animation];
animation.type = kCATransitionFade;
animation.duration = 0.4;
[instance.layer addAnimation:animation forKey:nil];

获取当前时间，日期

////获取当前时间，日期，不一定是自己想要的。。。因为时区的关系
NSDate *currentDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@”YYYY/MM/dd hh:mm:ss SS”];
NSString *dateString = [dateFormatter stringFromDate:currentDate];

设置导航栏
[self.navigationBar setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:19], NSForegroundColorAttributeName:[UIColor whiteColor]}];
[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@”navigationBarBg”] forBarMetrics:UIBarMetricsDefault];

状态栏
[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
[self.navigationController setNavigationBarHidden:YES animated:NO];

// 隐藏导航栏下的黑线
navBarHairlineImageView.hidden = YES;
// 显示导航栏下的黑线
navBarHairlineImageView.hidden = NO;

拨打网络电话的区别
[self openFuncCommd:@”tel://10086”];//没有弹出提示框,直接打过去
[self openFuncCommd:@”telprompt://10086”];//弹出打电话提示框

分段控制
pod ‘HMSegmentedControl’, ‘~> 1.1.0’

去除按钮的点击效果（忽闪一下阴影）
button.adjustsImageWhenHighlighted = NO;

xib情况下设置圆角
layer.cornerRadius layer.masksToBounds

这个方法 静默推送
- (void)application:(UIApplication )application didReceiveRemoteNotification:(NSDictionary )userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler
不管前后台都会走的 前提是 把静默推送打开

自己写的数组去重的方法，玩玩而已
NSMutableArray

- (UIToolbar *)keyBoardToolBar:(long)fieldIndex{    UIToolbar *toolB = [[UIToolbar alloc]init];    [toolB sizeToFit];    toolB.barStyle = UIBarStyleDefault;    //占位的btn，不然不好控制你按钮在toolbar里的位置    UIBarButtonItem *nullBtn = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];    UIBarButtonItem *done = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStylePlain target:self action:@selector(endSelfViewEdit)];    [done setTintColor:UIColorFromRGB(0x333333)];    [toolB setItems:@[nullBtn,done]];    return toolB;}

_phoneNumTextField.inputAccessoryView = [self keyboardToolBar:1];
输入框有内容时才能点击return键
_phoneNumTextField.enablesReturnKeyAutomatically = YES;

已经安装了CocoaPods的情况下，执行 touch Podfile 命令创建