ios的延遲執行方法
阿新 • • 發佈:2019-02-14
轉載源地址:http://poolo.iteye.com/blog/1820536
1.最直接的方法performSelector:withObject:afterDelay:
這種方法的缺點:每次要為延時寫一個方法
2.使用類別,用BOLCK執行
3.使用GCD
poolo:注意 圖中的dispatch_getcurrent_queue() 方法在ios6已經被kill了
現在用dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH,0)
第一個引數是優先順序有,第二個引數為0或nil
如果要要對介面操作則使用dispatch_get_main_queue();
參考:http://www.cnblogs.com/guwandong/archive/2012/08/08/2626211.html
4.可能是不太好的方法,用animation的completion引數
5.使用NSOperationQueue,在應用程式的下一個主迴圈執行:
這個和呼叫performSelector: with afterDelay of 0.0f等價
[程式碼]c#/cpp/oc程式碼:
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 |
[程式碼]c#/cpp/oc程式碼:
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 |
} |
[程式碼]c#/cpp/oc程式碼:
1 |
[UIView
animateWithDuration:0.0 delay:5.0 options:UIViewAnimationOptionAllowUserInteraction animations:^{ |
2 |
}
completion:^(BOOL finished) { |
3 |
//do
stuff here |
4 |
}]; |
[程式碼]c#/cpp/oc程式碼:
1 |
[[NSOperationQueue
mainQueue] addOperationWithBlock:aBlock]; |