ios中設定N秒後執行一個函數



設定N秒後執行一個函數，最常用的是設定一個定時器，今天剛看到有這樣一個函數，感覺還是比較簡單實用的，就先記下來，免得忘記了。

5秒後執行pushSecondController這個函數

[self performSelector:@selector(pushSecondController) withObject:nil ];

比如：在第一個視圖出現後5秒就跳轉到第二個視圖，代碼如下：

- (void) pushSecondController{ SecondViewController *secondController = [[SecondViewController alloc] initWithNibName:nil bundle:NULL]; [self.navigationController pushViewController:secondController animated:YES]; } - (void) viewDidAppear:(BOOL)paramAnimated{ [super viewDidAppear:paramAnimated]; [self performSelector:@selector(pushSecondController) withObject:nil afterDelay:5.0f]; }

5秒鐘後又跳回第一個頁面

- (void) goBack{ [self.navigationController popViewControllerAnimated:YES]; }- (void) viewDidAppear:(BOOL)paramAnimated{ [super viewDidAppear:paramAnimated]; [self performSelector:@selector(goBack) withObject:nil afterDelay:5.0f]; }