ContentMode scaleAspectToFit不工作

Question

我有3个视图。1.它是主视图，包含另外两个视图。2.它是一个比第一个更大的视图。3.它包含在第二个视图中。

我想将第二个视图(显然也是第三个视图)的大小调整为第一个视图的大小，保持纵横比不变。我尝试将contentMode设置为scaleToAspectFitt以获得此结果，但它不起作用。

UIView *yellowView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
yellowView.autoresizesSubviews = YES;
yellowView.backgroundColor = [UIColor yellowColor];
yellowView.autoresizesSubviews = YES;
yellowView.contentMode = UIViewContentModeScaleAspectFit;

UIView *blueView = [[UIView alloc] initWithFrame:CGRectMake(0,0,350,400)];
blueView.autoresizesSubviews = YES;
blueView.contentMode = UIViewContentModeScaleAspectFit;
blueView.autoresizingMask =  UIViewAutoresizingFlexibleWidth |  UIViewAutoresizingFlexibleHeight;

UIView *darkView = [[UIView alloc] initWithFrame:CGRectMake(200, 100, 40, 40)];
darkView.backgroundColor = [UIColor blackColor];
darkView.contentMode = UIViewContentModeScaleAspectFit;
darkView.autoresizingMask =  UIViewAutoresizingFlexibleWidth |  UIViewAutoresizingFlexibleHeight;

[blueView addSubview:darkView];
[yellowView addSubview:blueView];
[self.view addSubview:yellowView];

[yellowView setNeedsLayout];

[darkView release];
[blueView release];
[yellowView release];

Answer 1

在这里，我更改了一个视图，如下所示--您必须修改所有视图

    UIView *blueView = [[UIView alloc] initWithFrame:CGRectMake(0,0,350,400)];

    [blueView setAutoresizingMask:UIViewAutoresizingFlexibleWidth |  UIViewAutoresizingFlexibleHeight];


    [blueView setContentMode:UIViewContentModeScaleAspectFit];