资料

 

1.重写NSLog

#ifdef DEBUG //调试状态，打开LOG功能

#define ZYLog(...) NSLog(__VA_ARGS__)

#else //发布状态。关闭log功能

#define ZYLog(...)

#endif

 

2.设置选中的图标

UIImage *selectedImage = [UIImage imageWithName:selectedImageName];

// 声明这张图片用原图(别渲染)

selectedImage = [selectedImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

childVc.tabBarItem.selectedImage = selectedImage;

// 添加为tabbar控制器的子控制器

[self addChildViewController:childVc];

 

3.HTTP

<key>NSAppTransportSecurity</key>

<dict>

<key>NSAllowsArbitraryLoads</key>

<true/>

</dict>

 

4.定时器

[[NSRunLoop mainRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];

 

5.图片居中

- (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight __TVOS_PROHIBITED;

 

 

6.版本新特性

NSString *versionKey = (__bridge NSString *)kCFBundleVersionKey;

NSString *version = [NSBundle mainBundle].infoDictionary[versionKey];

NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];

if ([[userDefault objectForKey:versionKey] isEqualToString:version]) {

    self.window.rootViewController = [[ViewController alloc] init];

} else {

        self.window.rootViewController = [[NewFeatureViewController alloc] init];

    [userDefault setObject:version forKey:versionKey];

} 

// 显示主控制器（HMTabBarController）

HMTabBarViewController *vc = [[HMTabBarViewController alloc] init];

// 切换控制器

UIWindow *window = [UIApplication sharedApplication].keyWindow;

window.rootViewController = vc;

// push : [self.navigationController pushViewController:vc animated:NO];//内存问题

// modal : [self presentViewController:vc animated:NO completion:nil];//内存问题

// window.rootViewController : window.rootViewController = vc;

 

 

7.AVPlayerViewController

@property (nonatomic, strong) AVPlayer *player;

@property (nonatomic, strong) AVPlayerViewController  *playerView;

 

实现代码

NSString *playString = @"http://static.tripbe.com/videofiles/20121214/9533522808.f4v.mp4";

//视频播放的url

NSURL *playerURL = [NSURL URLWithString:playString];

 

//初始化

self.playerView = [[AVPlayerViewController alloc]init];

//AVPlayerItem 视频的一些信息  创建AVPlayer使用的

AVPlayerItem *item = [[AVPlayerItem alloc]initWithURL:playerURL]; 

//通过AVPlayerItem创建AVPlayer

self.player = [[AVPlayer alloc]initWithPlayerItem:item];

//给AVPlayer一个播放的layer层

AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:self.player];

layer.frame = CGRectMake(0, 100, self.view.frame.size.width, 200);

layer.backgroundColor = [UIColor greenColor].CGColor;

//设置AVPlayer的填充模式

layer.videoGravity = AVLayerVideoGravityResize;

[self.view.layer addSublayer:layer];

//设置AVPlayerViewController内部的AVPlayer为刚创建的AVPlayer

self.playerView.player = self.player; 

//关闭AVPlayerViewController内部的约束

self.playerView.view.translatesAutoresizingMaskIntoConstraints = YES;

点击播放

 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

    [self showViewController:self.playerView sender:nil];

}

 

8.coreData

NSSQLiteStoreType configuration:nil URL:storeURL options:@{NSMigratePersistentStoresAutomaticallyOption: @YES} error:&error

 

9.KVO观察机制

//KVO观察机制

/*

 调用者：被观察的对象

 参数1.观察的对象

 参数2.观察的属性

 参数3.观察的选项（观察新旧值）

 参数4.传递给回调函数的参数

 */

 

[self.bank addObserver:self forKeyPath:@"money" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil];

//一旦观察的属性发生变化，就会回调以下方法

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {

    //    keyPath观察的属性

    //    object被观察的对象

    //    change观察的信息

    //    context传递过来的参数