點擊按鈕後暫停線程

Question

我有下面的代碼 - 它創建一個UIActivityIndi​​catorView，並在按鈕單擊時執行登錄功能。我需要活動指示器在函數被調用之前顯示一段時間，所以我確實睡眠（10），但問題在於按鈕處於按下狀態（背景顏色從白色變爲藍色並凍結）以及activityindicatorview不顯示。當我刪除睡眠（10）時，它工作正常。在創建指標並且按鈕回到正常狀態之後，我該如何暫停線程？

-(IBAction)performLogin{ 
    UIActivityIndicatorView *view = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; 
    [view setFrame:CGRectMake(180, 13, 10, 10)]; 
    [view startAnimating]; 
    [btnLogin addSubview:view]; 
    [sleep(10)];  
    if ([self validatePassword] == YES) 
    { 
     [self performSegueWithIdentifier:@"goToMain" sender:self]; 
    } 
    else 
    { 
     [ErrorHandler showMessage:@"Wrong password" :@"Authentication"]; 
    } 
} 

Answer 1

將您的驗證，以單獨的方法，和延遲後調用它：

-(IBAction)performLogin{ 
    UIActivityIndicatorView *view = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; 
    [view setFrame:CGRectMake(180, 13, 10, 10)]; 
    [view startAnimating]; 
    [btnLogin addSubview:view]; 
    [self performSelector:@selector(performPasswordValidation) withObject:nil afterDelay:10]; 
} 

- (void)performPasswordValidation 
{ 
    if ([self validatePassword] == YES) 
    { 
     [self performSegueWithIdentifier:@"goToMain" sender:self]; 
    } 
    else 
    { 
     [ErrorHandler showMessage:@"Wrong password" :@"Authentication"]; 
    } 
}