加载屏幕没有集中在第二次启动

Question

我有一个UIView这是我的加载视图。它所做的只是显示循环加载循环（对于一个句子，大部分“圆圈”都是lol）。
它第一次正常工作，但之后，圆不居中。它向左和向下移动一些。我怎样才能让它始终居中，请记住，我限制了应用程序仅在所有视图中以横向模式显示（横向左侧，横向右侧），因此问题不是来自正在旋转的设备。

调用加载视图：

loadingViewController = [LoadingViewController loadSpinnerIntoView:self.view]; 

LoadingViewController.h：

#import <UIKit/UIKit.h> 
#import <QuartzCore/QuartzCore.h> 
#import "CrestronClient.h" 
@interface LoadingViewController : UIView 
{ 
    CrestronClient *cClient; 


} 
+(LoadingViewController *)loadSpinnerIntoView:(UIView *)superView; 
-(void)removeLoadingView; 
- (UIImage *)addBackground; 
@end 

LoadingView.m：

#import "LoadingViewController.h" 
#import "RootViewController.h" 
@implementation LoadingViewController 

CGRect priorFrameSettings; 
UIView *parentView; 


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    // Return YES for supported orientations 

    if (interfaceOrientation == UIInterfaceOrientationLandscapeLeft ||interfaceOrientation == UIInterfaceOrientationLandscapeRight) { 
     return YES; 
    }else{ 
     return NO; 
    } 

} 


-(void)removeLoadingView 
{ 

// [parentView setFrame:priorFrameSettings]; 

    CATransition *animation = [CATransition animation]; 

    [animation setType:kCATransitionFade]; 

    [[[self superview] layer] addAnimation:animation forKey:@"layerAnimation"]; 

    [self removeFromSuperview]; 
} 

+(LoadingViewController *)loadSpinnerIntoView:(UIView *)superView 
{ 

    priorFrameSettings = superView.frame; 
    parentView = superView; 
    // [superView setFrame:CGRectMake(0, 0, 1024, 1024)]; 


    // Create a new view with the same frame size as the superView 


LoadingViewController *loadingViewController = [[LoadingViewController alloc] initWithFrame:superView.frame]; 

loadingViewController.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; 

    // If something's gone wrong, abort! 

    if(!loadingViewController){ return nil; } 


    [superView addSubview:loadingViewController]; 

    if(!loadingViewController){ return nil; } 

    // This is the new stuff here ;) 

    UIActivityIndicatorView *indicator = 

    [[[UIActivityIndicatorView alloc] 

     initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleWhiteLarge] autorelease]; 

    // Set the resizing mask so it's not stretched 
    UIImageView *background = [[UIImageView alloc] initWithImage:[loadingViewController addBackground]]; 

    // Make a little bit of the superView show through 

    background.alpha = 0.7; 

    [loadingViewController addSubview:background]; 

    indicator.autoresizingMask = 

    UIViewAutoresizingFlexibleTopMargin | 

    UIViewAutoresizingFlexibleRightMargin | 

    UIViewAutoresizingFlexibleBottomMargin | 

    UIViewAutoresizingFlexibleLeftMargin; 

    // Place it in the middle of the view 

    indicator.center = superView.center; 

    // Add it into the spinnerView 

    [loadingViewController addSubview:indicator]; 

    // Start it spinning! Don't miss this step 

    [indicator startAnimating]; 


    // Create a new animation 

    CATransition *animation = [CATransition animation]; 

    // Set the type to a nice wee fade 

    [animation setType:kCATransitionFade]; 

    // Add it to the superView 

    [[superView layer] addAnimation:animation forKey:@"layerAnimation"]; 


    return loadingViewController; 

} 
- (UIImage *)addBackground{ 

    cClient = [CrestronClient sharedManager]; 
    if (cClient.isConnected == FALSE) { 
     [cClient connect]; 
    } 
    // Create an image context (think of this as a canvas for our masterpiece) the same size as the view 

    UIGraphicsBeginImageContextWithOptions(self.bounds.size, YES, 1); 

    // Our gradient only has two locations - start and finish. More complex gradients might have more colours 

    size_t num_locations = 2; 

    // The location of the colors is at the start and end 

    CGFloat locations[2] = { 0.0, 1.0 }; 

    // These are the colors! That's two RBGA values 

    CGFloat components[8] = { 

     0.4,0.4,0.4, 0.8, 

     0.1,0.1,0.1, 0.5 }; 

    // Create a color space 

    CGColorSpaceRef myColorspace = CGColorSpaceCreateDeviceRGB(); 

    // Create a gradient with the values we've set up 

    CGGradientRef myGradient = CGGradientCreateWithColorComponents (myColorspace, components, locations, num_locations); 

    // Set the radius to a nice size, 80% of the width. You can adjust this 

    float myRadius = (self.bounds.size.width*.8)/2; 

    // Now we draw the gradient into the context. Think painting onto the canvas 

    CGContextDrawRadialGradient (UIGraphicsGetCurrentContext(), myGradient, self.center, 0, self.center, myRadius, kCGGradientDrawsAfterEndLocation); 

    // Rip the 'canvas' into a UIImage object 

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); 

    // And release memory 

    CGColorSpaceRelease(myColorspace); 

    CGGradientRelease(myGradient); 

    UIGraphicsEndImageContext(); 

    // … obvious. 

    return image; 

} 
- (void)dealloc { 

    [super dealloc]; 
} 
@end 

Answer 1

加入

[background setFrame:CGRectMake(0, 0, 1024, 768)]; 

固定的背景和固定的圆的中心有：

indicator.center = background.center; 

Answer 2

确保装载视图设置为其父框架并设置了适当的autoresizingMask。这可能是由UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight。