iOS最小化视图和左上角的所有子视图

我有一个

ui视图

，其中包含一些子视图（以及其中的一些子视图）。我试图最小化屏幕左上角的整个视图，直到它达到一定的大小（20 x 20），但我在这样做时遇到了麻烦

我首先尝试了

[UIView beginAnimations:nil context:nil]但这并没有调整子视图的大小。此外，由于其他子视图的填充和数量，很难将每个子视图框架设置为新的大小并使其正常工作

然后我尝试了以下代码：

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2.0f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];

[self.myCardsCarousel.layer setAnchorPoint:CGPointMake(0.0f, 0.0f)];
[self.myCardsCarousel setTransform:CGAffineTransformMakeScale(0.0f, 0.0f)];

CGRect addCardsButtonFrame = self.addCardsButton.frame;
addCardsButtonFrame.size.height = 0.0f;

[self.addCardsButton setFrame:addCardsButtonFrame];

[UIView commitAnimations];

但这并没有最小化到屏幕左上角。相反，它最小化到屏幕的死点

如何将其锚定到屏幕左上角？此外，当视图达到一定大小时，如何停止
cGraffineTransformMakeScale（）
。
一个可能的解决方案是创建视图的快照，并将快照动画化到角落（假设最小化视图可以是静态的）。事件的一般顺序是


在内存位图中创建父视图的快照
从快照创建UIImageView
将UIImageView放置在父视图前面
使用父视图的
hidden
属性隐藏父视图
将UIImageView设置为角点的动画

恢复视图的步骤

// create a snapshot image of the parent view
UIGraphicsBeginImageContextWithOptions( self.parentView.bounds.size, YES, 0 );
CGContextRef context = UIGraphicsGetCurrentContext();
[self.parentView.layer renderInContext:context];
UIImage *snapshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

// create a UIImageView from the snapshot
self.snapshotView = [[UIImageView alloc] initWithFrame:self.parentView.frame];
self.snapshotView.image = snapshot;
[self.view addSubview:self.snapshotView];

// hide the parent view in place, while animating the snapshot view into the corner
self.parentView.hidden = YES;
[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseInOut
animations:^
{
     self.snapshotView.frame = CGRectMake( 0, 0, 20, 20 );
}
completion:nil];

[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseInOut
animations:^
{
    // animate the snapshot view back to original size
    self.snapshotView.frame = self.parentView.frame;
}
completion:^(BOOL finished)
{
    // reveal the parent view and discard the snapshot view
    self.parentView.hidden = NO;
    [self.snapshotView removeFromSuperview];
    self.snapshotView = nil;
}];


将UIImageView设置回其原始位置的动画
取消隐藏父视图
卸下UIImageView并丢弃它

首先，需要UIImageView的属性

@property (strong, nonatomic) UIImageView *snapshotView;

下面是最小化视图的代码

// create a snapshot image of the parent view
UIGraphicsBeginImageContextWithOptions( self.parentView.bounds.size, YES, 0 );
CGContextRef context = UIGraphicsGetCurrentContext();
[self.parentView.layer renderInContext:context];
UIImage *snapshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

// create a UIImageView from the snapshot
self.snapshotView = [[UIImageView alloc] initWithFrame:self.parentView.frame];
self.snapshotView.image = snapshot;
[self.view addSubview:self.snapshotView];

// hide the parent view in place, while animating the snapshot view into the corner
self.parentView.hidden = YES;
[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseInOut
animations:^
{
     self.snapshotView.frame = CGRectMake( 0, 0, 20, 20 );
}
completion:nil];

[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseInOut
animations:^
{
    // animate the snapshot view back to original size
    self.snapshotView.frame = self.parentView.frame;
}
completion:^(BOOL finished)
{
    // reveal the parent view and discard the snapshot view
    self.parentView.hidden = NO;
    [self.snapshotView removeFromSuperview];
    self.snapshotView = nil;
}];

下面是恢复视图的代码

// create a snapshot image of the parent view
UIGraphicsBeginImageContextWithOptions( self.parentView.bounds.size, YES, 0 );
CGContextRef context = UIGraphicsGetCurrentContext();
[self.parentView.layer renderInContext:context];
UIImage *snapshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

// create a UIImageView from the snapshot
self.snapshotView = [[UIImageView alloc] initWithFrame:self.parentView.frame];
self.snapshotView.image = snapshot;
[self.view addSubview:self.snapshotView];

// hide the parent view in place, while animating the snapshot view into the corner
self.parentView.hidden = YES;
[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseInOut
animations:^
{
     self.snapshotView.frame = CGRectMake( 0, 0, 20, 20 );
}
completion:nil];

[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseInOut
animations:^
{
    // animate the snapshot view back to original size
    self.snapshotView.frame = self.parentView.frame;
}
completion:^(BOOL finished)
{
    // reveal the parent view and discard the snapshot view
    self.parentView.hidden = NO;
    [self.snapshotView removeFromSuperview];
    self.snapshotView = nil;
}];

抱歉，我没有足够的时间发布完整的答案，只是一些提示：如果您想缩放和移动视图，请使用组合变换，例如CGAffineTransformConcat（CGAffineTransformMakeScale（0.2，0.2），CGAffineTransformMakeTransform（-160，-320）），一旦动画正在进行，您就不能停止它，当比例因子达到某个值时。只需计算正确的目标比例x和y因子，并将它们传递到CGAffineTransformMakeScale函数中。