9.21 Block、协议、通知
2016-09-22 本文已影响15人
jayck
Block
注: 将时机放到自己成员函数内部,防止出现循环引用
CustomView.h文件
@interface CustomView : UIView
- (void)demoFunc:(void(^)(void))handle;
@end
CustomView.m文件
@interface CustomView (){
void (^globalHandle)(void);
}
@end
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
if(globalHandle){
globalHandle();
}
}
- (void)demoFunc:(void (^)(void))handle{
globalHandle = handle;
}
ViewController.h文件
CustomView *v = [[CustomView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
v.center = self.view.center; [self.view addSubview:v];
v.backgroundColor = [UIColor redColor]; [v demoFunc:^{
NSLog(@"hello world");
}];
协议
Custom.h文件
@protocol CustomViewDelegate <NSObject>
@optional- (void)messageSend;
@end@property(nonatomic,weak)id<CustomViewDelegate> delegate;
Custom.m文件
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
if([self.delegate respondsToSelector:@selector(messageSend)]){
[self.delegate messageSend];
}
}
ViewController.h文件
{
CustomView *v = [[CustomView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
v.center = self.view.center;
[self.view addSubview:v];
v.backgroundColor = [UIColor redColor];
v.delegate = self;
}
- (void)messageSend{ NSLog(@"hello world_delegate");
}
通知
注: 通知一般用于一对多,当"1"里面的代码比较多的时候,会影响"2"后面代码的执行,key比较难管理。而且一旦某个过程慢了半拍,或者出现卡顿时,其他函数也会被影响。
Custom.m文件
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
[[NSNotificationCenter defaultCenter]postNotificationName:@"kClicked" object:nil];
}//"2"
ViewController
{
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(notiHandle:) name:@"kClicked" object:nil];
}
- (void)notiHandle:(NSNotification*)noti{
// "1" NSLog(@"hello world_noti");
}