Block
注: 将闭包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
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
{
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
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");
sleep(3);
}
