自动调整大小不适用于以编程方式添加的UIView

Question

我已经按照此SO链接进行了自动调整大小 ，但是自动调整大小不起作用。
如何通过自动调整大小以编程方式设置框架？

我已经为iPhone 4设置了框架

UIView *box = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 120)];
[box setBackgroundColor:[UIColor redColor]];

[box setAutoresizingMask:UIViewAutoresizingFlexibleHeight];
[box setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
[box setAutoresizingMask:UIViewAutoresizingFlexibleTopMargin];
[box setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
[box setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];

[self.view addSubview:box];

但它不适用于iPad或iPhone 6

Answer 1

首先，根据公开建议，您应该使用约束。

将自动调整大小的蒙版添加到视图后，添加它。

UIView *box = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 120)];
[box setBackgroundColor:[UIColor redColor]];
[self.view addSubview:box];

[box setAutoresizingMask:UIViewAutoresizingFlexibleHeight];
[box setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
[box setAutoresizingMask:UIViewAutoresizingFlexibleTopMargin];
[box setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
[box setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];

Answer 2

如果我理解您的问题正确，那么您正在尝试将红色视图设置为高度= 120

添加说明

您可以使用约束来实现：

        UIView *box = [[UIView alloc] init];
// Prevent creating constraints from masks automatically
        box.translatesAutoresizingMaskIntoConstraints = NO;
        box.backgroundColor = [UIColor redColor];
        [self.view addSubview:box];

// Define metrics (constants) which will be used to create constraints.
// Key @"boxSize" - name which will be used in constraints, Value - constant
        NSDictionary *metrics = @{@"boxSize" : @(120)};

// Define views that will participate in auto layout constraints.
// Key @"readBox" - name which will be used in constraints, Value - real UIView object
        NSDictionary *views = @{ @"redBox" : box };


// Here we create constraints. For Vertical, and for Horizontal

// I'm using Visual language format (you can find it in Apple Documentation
// In a few words:
// H:|-0-[redBox]-0-|
// "H" - means horizontal
// "|" - short cut for parent view (in our case it is UIViewController.view) 
// "[redBox]" - view name from view's dictionary
// "-0-" - gap between views (you could set number), in our case it is "|" and "[redBox]"
// "[redBox(boxSize)]" - means that view (redBox) size should be qual to "boxSize" from metrics' dictionary 


        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[redBox]-0-|" options:NSLayoutFormatAlignAllCenterY metrics:metrics views:views]];

        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[redBox(boxSize)]" options:NSLayoutFormatAlignAllCenterY metrics:metrics views:views]];

苹果资料

Answer 3

您正在使用框架(0, 0, 320, 120) 0，0，320，120）设置UIView。 该框架将适合iPhone 4屏幕，因为手机屏幕宽度为320像素。 但是当您在iPhone 6 / 6s中运行代码时，您无法期望得到相同的结果。 设置自动调整大小将无法解决此问题。 您需要为此使用约束/自动布局。

Autoresizing masks describe how a subview will resize or move when its superview is resized.

因此，添加此视图后，如果更改手机方向，则会相应地调整视图的大小。 但是您需要首先根据超级视图设置框架。 您可以动态设置宽度，例如： (0, 0, self.view.frame.size.width, 120) 。