如何让我的视野缩小并消失？

Question

当我的用户按下按钮时，我希望可见视图缩小并消失，从而显示下面的父视图。目前我有这个，几乎可以工作：

-(void)deleteNoteTransition
{
    self.view.userInteractionEnabled=NO;
    [UIView beginAnimations:@"deleteNote" context:nil];
    [UIView setAnimationDuration:0.6];
    self.view.transform=CGAffineTransformMakeScale(0.01,0.01);
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(animationDidStop:)];
    [UIView commitAnimations];
}

- (void)animationDidStop:(NSString *)anim finished:(BOOL)flag
{
    self.view.userInteractionEnabled=YES;
    if ([anim isEqualToString:@"deleteNote"]) {
    [self.navigationController popViewControllerAnimated:YES];
    }
}

但是，这样做有两个问题：

• 进行缩小的视图不是“整体”视图 - 它不包括标题栏和工具栏。
• 视图缩小以显示纯白色背景，然后才触发第二种方法，因此白色背景被毫不客气地替换为父视图。

有没有办法包含整个屏幕并平滑地显示背后的父视图控制器，而无需进入对于我目前的编程水平来说过于复杂的 OpenGL 内容？

Answer 1

这应该可以捕捉到你的整个视图：

#import <QuartzCore/QuartzCore.h>
UIGraphicsBeginImageContext(viewToCapture.bounds.size);
[viewToCapture.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

一旦您将视图捕捉到图像，请使用此方法缩放和淡化图像：

UIImageView *firstView = nil;

-(void)animateOut:(UIImage*)image {
    firstView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0, 320, 480)];
    firstView.image = image
    [window addSubview:firstView];
    [window bringSubviewToFront:firstView];
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:1.0];
    [UIView setAnimationTransition:UIViewAnimationTransitionNone forView:window cache:YES];
    [UIView setAnimationDelegate:self]; 
    [UIView setAnimationDidStopSelector:@selector(startupAnimationDone:finished:context:)];
    firstView.alpha = 0.0;
    // change this for a different scale
    firstView.frame = CGRectMake(-60, -85, 440, 635);  
    [UIView commitAnimations];
}

- (void)startupAnimationDone:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
    [firstView removeFromSuperview];
    [firstView release];
}

您可以从[UIApplication sharedApplication] 获取窗口，或者只是将其添加为当前视图控制器的视图的子视图。