初始屏幕iOS僅顯示在模擬器上並且大小錯誤

Question

當我使用下面提到的代碼時，我在iPhone模擬器上獲得了淡出的所需初始屏幕，但圖片似乎用因子2縮放：我只能看到我的初始圖片左上角四分之一（=發射圖像），放大到全屏。在啓動畫面啓動之前，啓動映像本身的大小顯示爲正確大小。

代碼在AppDelegate中的didFinishLaunchingWithOptions中輸入。

// Splash screen 
    UIImageView*imageView=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"IMG_1357.png"]]; 
    [[navigationController view] addSubview:imageView]; 
    [[navigationController view] bringSubviewToFront:imageView]; 

    // as usual 
    [self.window makeKeyAndVisible]; 

    //now fade out splash image 
    [UIView transitionWithView:self.window duration:4.0f options:UIViewAnimationOptionTransitionNone animations:^(void){imageView.alpha=0.0f;} completion:^(BOOL finished){[imageView removeFromSuperview];}]; 

此外初始屏幕似乎沒有出現在設備（iPhone 4S（視網膜）與iOS 6.0）上，只在模擬器上：當在iPhone上運行，它只顯示啓動圖像。

這兩個問題的原因和解決方案是什麼？ 在此先感謝！

Answer 1

1. 安裝框架ImageView的，否則具有相同的尺寸作爲圖像
2. 設置正確contentMode
3. 嘗試使用self.window，代替[navigationController視圖]

實施例：

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"IMG_1357.png"]]; 
imageView.contentMode = UIViewContentModeScaleAspectFill; 
imageView.frame = self.window.bounds; 
[self.window addSubview:imageView]; 
[imageView release]; 

[self.window makeKeyAndVisible]; 

//now fade out splash image 
[UIView transitionWithView:self.window 
        duration:4.0f 
        options:UIViewAnimationOptionTransitionNone 
       animations:^(void) { 
        imageView.alpha = 0.0f; 
       } 
       completion:^(BOOL finished){ 
        [imageView removeFromSuperview]; 
       }]; 

要淡出之前出添加1秒的停頓：

int64_t delayInSeconds = 1.0; 
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC); 
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ 
    [UIView transitionWithView:self.window 
         duration:4.0f 
         options:UIViewAnimationOptionTransitionNone 
        animations:^(void) { 
         imageView.alpha=0.0f; 
        } 
        completion:^(BOOL finished){ 
         [imageView removeFromSuperview]; 
        }]; 
}); 

或

[self performSelector:@selector(_hideSplash:) withObject:imageView afterDelay:1.0]; 

- (void) _hideSplash:(UIView *)view 
{ 
    [UIView transitionWithView:self.window 
         duration:4.0f 
         options:UIViewAnimationOptionTransitionNone 
        animations:^(void) { 
         view.alpha=0.0f; 
        } 
        completion:^(BOOL finished){ 
         [view removeFromSuperview]; 
        }];  
}