iOS延时执行的几种方法

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iOS延时执行的几种方法

热度 7已有 20486 次阅读 2012-6-1 11:16 |系统分类:ios

 
 
1.最直接的方法performSelector:withObject:afterDelay:
这种方法的缺点:每次要为延时写一个方法
 
2.使用类别,用BOLCK执行

[代码]c#/cpp/oc代码:

01 @implementation NSObject (PerformBlockAfterDelay)
02  
03 - (void)performBlock:(void (^)(void))block
04           afterDelay:(NSTimeInterval)delay
05 {
06     block = [[block copy] autorelease];
07     [self performSelector:@selector(fireBlockAfterDelay:)
08                withObject:block
09                afterDelay:delay];
10 }
11  
12 - (void)fireBlockAfterDelay:(void (^)(void))block {
13     block();
14 }
15  
16 @end
 
3.使用GCD

[代码]c#/cpp/oc代码:

1 void RunBlockAfterDelay(NSTimeInterval delay, void (^block)(void))
2 {
3     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC*delay),
4       dispatch_get_current_queue(), block);
5 }
 
4.可能是不太好的方法,用animation的completion参数

[代码]c#/cpp/oc代码:

1 [UIView animateWithDuration:0.0 delay:5.0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
2 } completion:^(BOOL finished) {
3     //do stuff here
4 }];
 
5.使用NSOperationQueue,在应用程序的下一个主循环执行:

[代码]c#/cpp/oc代码:

1 [[NSOperationQueue mainQueue] addOperationWithBlock:aBlock];
 
这个和调用performSelector: with afterDelay of 0.0f等价
原文地址:https://www.cnblogs.com/hanyis/p/3660051.html