[問題] 如何讓UIAlertController顯示在前面

[tonyshan (Iamyourfather)]

在AppDelegate 想做出錯誤時白色背景(whiteView)前面放UIAletController的dialog

但不管怎麼改都是whiteView在UIAlertController上面

如果把whiteView用sendSubviewToBack背景又會變成viewController的畫面

雖然把UIAlertController改成用UIAlertView可以解決這個問題

不過有很多method想用UIAlertController去執行

以下簡單的原碼=>
#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (void)applicationDidBecomeActive:(UIApplication *)application {
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    // a為flag
    //[self alert_Dialog:@"0"]
    [self alert_Dialog:@"0"];
}


-(void)alert_Dialog :(NSString *)str
{
    //_window.rootViewController = [[UIViewController alloc] init];
    if ([str isEqualToString:@"1"]) {
        NSLog(@"OK");
    }else{
        UIAlertController *alert =
        [UIAlertController alertControllerWithTitle:@"錯誤" message:@"error" preferredStyle:UIAlertControllerStyleAlert];

        [alert addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
            //按下"確定"後結束程式
            exit(1);
                 }
                          ]];
        //白色背景
        [self whiteView];
        [self.window.rootViewController presentViewController:alert animated:YES completion:nil];


    }
}

-(void)whiteView
{
    CGRect rect1 = [[UIScreen mainScreen] bounds];
    UIView *myView = [[UIView alloc] initWithFrame:rect1];
    myView.backgroundColor = [UIColor whiteColor];
    [self.window addSubview:myView];

}

@end
===================================================================
謝謝

--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 126.185.171.225
※ 文章網址: https://www.ptt.cc/bbs/MacDev/M.1422185765.A.6E4.html
→ darktt: presentViewController之後已經是不同的viewController了
→ darktt: 所以key window會跟著換一個
→ darktt: 呃，好像搞錯了，應該是你不能在self.window上加view
→ darktt: window的view的優先層級比rootViewController還要高，
→ darktt: 所以永遠會在最上方
推 howdiun: 1. 抓出currentViewController 2.用UIAlertView
→ uranusjr: UIAlertView 已經被 deprecated 了, 不要用
推 tentenlee: 要支援IOS7 不能用UIALERTCONTROLLER吧?
→ nobody1: 推樓上  還要並行一段時間再修整
了解 我今天再去試一下好了~
不過之所以用rootViewController是因為在AppDelegate之下的關係
如果沒加上去的話會錯誤
※ 編輯: tonyshan (126.155.167.245), 01/27/2015 05:29:54
※ 編輯: tonyshan (126.155.167.245), 01/27/2015 05:33:05