問題分析：iOS8以後，當前介面有UITextField、UITextView等輸入框時, 需要點選確定pop到上一個頁面或者彈出UIAlertView等彈框時, 會出現pop介面後鍵盤出現又隱藏的問題, 這是alertView的動畫和鍵盤動畫起衝突了導致的。
(程式碼源於網路，侵權刪！)

第一種: 等鍵盤完全收起之後再pop、push或者彈出UIAlertView。直接dispatch_after個至少0.25秒再執行pop或者push。至於為什麼是0.25秒,因為系統鍵盤收起或顯示的duration就是0.25秒。

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if
 
 (buttonIndex==0) {
        __weak typeof(self) weakSelf = self;
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [weakSelf backForward];
        });
    }
}

- (void)backForward {
    [self.navigationController popViewControllerAnimated:YES];
}
 

第二種: 在iOS8的SDK中,蘋果提倡使用UIAlertController取代UIAlertView。

官方解釋如下：

NS_CLASS_DEPRECATED_IOS(2_0, 9_0, “UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead”) __TVOS_PROHIBITED

NS_CLASS_DEPRECATED_IOS(2_0, 8_3, “UIActionSheet is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleActionSheet instead”) __TVOS_PROHIBITED

參考程式碼如下：

#define SYSTEM_VERSION [[UIDevice currentDevice].systemVersion floatValue]
if (SYSTEM_VERSION >= 8.0) {
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil  message:@"提示文字" preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
    [self.navigationController popToViewController:viewController animated:YES];
    }];
    [alertController addAction:okAction];
    [self presentViewController:alertController animated:YES completion:nil];
    } else {
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"" message:@"提示文字" delegate:self cancelButtonTitle:@"確定" otherButtonTitles: nil];
    [alertView show];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    [self.navigationController popToViewController:viewController animated:YES];
}

共同學習，留念備忘