iOS 开发小技巧-持续更新~

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1.修改xib创建视图的圆角
layer.cornerRadius
layer.vorderWidth
这里写图片描述
2.cell分割线不能到达屏幕左边距

- (void)viewDidLoad {    [super viewDidLoad];    //解决不能cell分割线不能到达左边距    if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {  [self.tableView setSeparatorInset:UIEdgeInsetsZero];   }  if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {   [self.tableView setLayoutMargins:UIEdgeInsetsZero];   }   }   //在willDisplayCell中，添加代码- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {    if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {        [cell setSeparatorInset:UIEdgeInsetsZero];    }    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {        [cell setLayoutMargins:UIEdgeInsetsZero];    }}

3阻止文件被iTunes和iCloud同步原文

#import “sys/xattr.h”- (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL{const char* filePath = [[URL path] fileSystemRepresentation];const char* attrName = “com.apple.MobileBackup”;u_int8_t attrValue = 1;int result = setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);return result == 0;}- (void)addSkipBackupAttributeToPath:(NSString*)path {u_int8_t b = 1;setxattr([path fileSystemRepresentation], “com.apple.MobileBackup”, &b, 1, 0, 0);}两种方法任选其一

4.删除视图上的所有子视图

[XXXX.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];

5.在代码块中添加“<##>”,使自己想要输入的地方，变成可输入状态

 [MobClick event:@"XXXXX"]; //将@“xxxxx”用<##>代替变成  [MobClick event: ];

6.APP申请加急审核这里写链接内容https://developer.apple.com/contact/app-store/?topic=expedite
7.使用Reveal连接模拟器调试界面
给出了如何不用修改Xcode工程就可以加载使用Reveal的方法。

在当前用户目录新建一个文件.lldbinit，位于~/.lldbinit，LLDB每次启动的时候都会加载这个文件。

在.lldbinit中输入如下内容：

command alias reveal_load_sim expr (void*)dlopen("/Applications/Reveal.app/Contents/SharedSupport/iOS-Libraries/libReveal.dylib", 0x2);command alias reveal_load_dev expr (void*)dlopen([(NSString*)[(NSBundle*)[NSBundle mainBundle] pathForResource:@"libReveal" ofType:@"dylib"] cStringUsingEncoding:0x4], 0x2);command alias reveal_start expr (void)[(NSNotificationCenter*)[NSNotificationCenter defaultCenter] postNotificationName:@"IBARevealRequestStart" object:nil];command alias reveal_stop expr (void)[(NSNotificationCenter*)[NSNotificationCenter defaultCenter] postNotificationName:@"IBARevealRequestStop" object:nil];

上述文件创建了4个命令：
reveal_load_sim,reveal_load_dev, reveal_start 和 reveal_stop
reveal_load_sim 这个只在iOS模拟器上有效。它从Reveal的应用程序bundle中找到并加载libReveal.dylib（请确保你把Reveal安装到了系统的Application文件夹，如果你换地方了，你修改上述的文件）。
reveal_load_dev 这个命令在iOS设备和模拟器上都有效。不过，它需要你在Build Phase中的的Copy Bundle Resources中加上libReveal.dylib，请确保没有放到Link Binary With Libraries这个地方。
reveal_start 这个命令发出一个通知启动Reveal Server。
reveal_stop 这个命令发出一个通知停止Reveal Server。
请注意：只有在iOS应用发出了UIApplicationDidFinishLaunchingNotification通知之后，比如应用的delegate已经处理过application::didFinishLaunchingWithOptions:之后才能调用上面的reveal_load_*命令，然后再调用reveal_start

在设备起来之后，你就可以断下应用，
这里写图片描述
7.启动界面加载广告，需要SDWebImage，

#import "AppDelegate.h"#import "UIImageView+WebCache.h"@interface AppDelegate ()@property (strong, nonatomic) UIView *lunchView;@end@implementation AppDelegate@synthesize lunchView;- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    [self.window makeKeyAndVisible];    lunchView = [[NSBundle mainBundle ]loadNibNamed:@"LaunchScreen" owner:nil options:nil][0];    lunchView.frame = CGRectMake(0, 0, self.window.screen.bounds.size.width, self.window.screen.bounds.size.height);    [self.window addSubview:lunchView];    UIImageView *imageV = [[UIImageView alloc] initWithFrame:CGRectMake(0, 50, 320, 300)];    NSString *str = @"http://www.jerehedu.com/images/temp/logo.gif";    [imageV sd_setImageWithURL:[NSURL URLWithString:str] placeholderImage:[UIImage imageNamed:@"default1.jpg"]];    [lunchView addSubview:imageV];    [self.window bringSubviewToFront:lunchView];    [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(removeLun) userInfo:nil repeats:NO];    return YES;}-(void)removeLun{    [lunchView removeFromSuperview];}

8.使用SDWebImage,清除图片缓存的

1.找到SDImageCache类2.添加如下方法：- (float)checkTmpSize {    float totalSize = 0;    NSDirectoryEnumerator *fileEnumerator = [[NSFileManager defaultManager] enumeratorAtPath:diskCachePath];    for (NSString *fileName in fileEnumerator) {       NSString *filePath = [diskCachePath stringByAppendingPathComponent:fileName];       NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];       unsigned long long length = [attrs fileSize];      totalSize += length / 1024.0 / 1024.0;    }      return totalSize;}//在设置中使用- (IBAction)cleanButton:(id)sender {    NSLog(@"清除缓存");    [[SDImageCache sharedImageCache] clearDisk];    [[SDWebImageManager sharedManager].imageCache clearMemory];    [[SDWebImageManager sharedManager].imageCache clearDisk];    [tableView reloadData];    //计算清除后的缓存大小    float tmpSize1 = [[SDImageCache sharedImageCache] checkTmpSize];    self.cacheNamber.text = [NSString stringWithFormat:@"%.1fM",tmpSize1];}方法二，方法二比方法1好用//清除缓存- (void)sheZhi{    // 获取Caches 目录路径    NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];    //浮点 获取folderSizeAtPath 方法里传来的值    CGFloat fileSize = [self folderSizeAtPath:cachPath];    // GCD   线程管理   不多说，    dispatch_async(dispatch_get_main_queue(), ^{        sd =[NSString stringWithFormat:@"%.2fMB",fileSize];        NSLog(@"%@",sd);        self.cacheNamber.text = sd;    });}- (CGFloat)folderSizeAtPath:(NSString *)folderPath{    //  获取缓存大小，    NSFileManager *manager = [NSFileManager defaultManager];    if (![manager fileExistsAtPath:folderPath]) {        return 0;    }    // NSEnumerator （枚举） NSEnumerator用来描述这种集合迭代运算的方式， 通过objectEnumerator向数组请求枚举器，如果想从后向前浏览集合，可使用reverseObjectEnumerator方法。    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];    NSString *fileName = nil;    long long folderSize = 0;    //在获得枚举器后，可以开始一个while循环，每次循环都向这个枚举器请求它的下一个对象:nextObject。nextObject返回nil值时，循环结束。    while ((fileName = [childFilesEnumerator nextObject]) != nil) {        NSString *fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];        folderSize += [self fileSizeAtPath:fileAbsolutePath];    }    // 因为得到的数据时bate ，所以转换成mb    return folderSize/(1024.0*1024.0);}- (long long)fileSizeAtPath:(NSString *)filePath{    NSFileManager* manager = [NSFileManager defaultManager];    if ([manager fileExistsAtPath:filePath]){        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];    }    return 0;}//清除缓存-(void)myClearCacheAction{    dispatch_async(                   dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)                   , ^{                       // GCD 获取文件地址，文件里的数据个数                       NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];                       NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachPath];                       NSLog(@"%@",cachPath);                       NSLog(@"files :%lu",(unsigned long)[files count]);                       for (NSString *p in files) {                           NSError *error;                           NSString *path = [cachPath stringByAppendingPathComponent:p];                           if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {                               [[NSFileManager defaultManager] removeItemAtPath:path error:&error];                           }                           //                           NSString * cachePath =@"qwe";                           CGFloat fileSize = [self folderSizeAtPath:cachPath];                           dispatch_async(dispatch_get_main_queue(), ^{                               NSString *sdd  = [NSString stringWithFormat:@"%.2fMB",fileSize];                               NSLog(@"%@",sdd );                               self.cacheNamber.text = sdd;                           });                       }                       [self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nil waitUntilDone:YES];});}-(void)clearCacheSuccess{    NSLog(@"清理成功");}

9.cocoapods引入框架，头文件不能联想的问题
**选择Target -> Build Settings 菜单，找到\”User Header Search Paths\”设置项
新增一个值”${SRCROOT}”，并且选择\”Recursive\”，这样xcode就会在项目目录中递归搜索文件**
10.导航栏透明，iOS7以上，需要一张透明照片

    UIImage *image = [UIImage imageNamed:@"bj.jpg"];    [self.navigationController.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];    [self.navigationController.navigationBar setShadowImage:image];

11.获取当前的版本号

代码实现获得应用的Verison号：[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"]或[[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"];获得build号：[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"]

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