autoresizingMask 和固定边距的问题

Question

我试图让它与 ViewController 视图中的代码一起使用：

但我无法将其实现工作。

我已经尝试过

-(void)loadView {
    UIView *contentView = [[[UIView alloc] init] autorelease];
    self.view = contentView;
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(5,5,0,100);
    button.autoresizingMask = UIViewAutoresizingFlexibleWidth;
    [contentView addSubview:button];
}

，但按钮的宽度仍然是超级视图的宽度......

我确信有一个简单的解释。

谢谢大家！

安东尼奥

Answer 1

-initWithFrame: 是 UIView 的指定初始化器。在 Mac 端（NSView），我知道使用 -init 而不是 -initWithFrame: 时可能会发生奇怪的事情。也许这就是问题所在？

Answer 2

我不用担心 autoresizingMask 标志，而是在自定义 UIView 子类中重写 layoutSubviews：

- (void)loadView {
    self.view = [ContentView view];
    self.view.frame = CGRectMake(0, 0, 30, 100);
}

其中 ContentView 定义为：

@interface ContentView : UIView {
    UIButton *button;
}

+ (id)view;

@end

@implementation ContentView {

+ (id)view {
    return [[self new] autorelease];
}

- (id)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        button = [UIButton buttonWithType:UIButtonTypeCustom];
        [self addSubview:button]; // Retains the button.
    }
    return self;
}

- (void)layoutSubviews {
    const CGFloat margin = 5;

    CGRect size = self.frame.size;
    button.frame = CGRectMake(margin, margin,
        size.width - 2 * margin,
        size.height - 2 * margin);
}

}

Answer 3

试试这个代码。

- (void)loadView
{
    CGRect screenBounds = [UIScreen mainScreen].bounds;
    UIView *contentView = [[[UIView alloc] initWithFrame:screenBounds] autorelease];
    self.view = contentView;
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(5,5,screenBounds.size.width - 10,100);
    [button setTitle:@"hello" forState:UIControlStateNormal];
    button.autoresizingMask = UIViewAutoresizingFlexibleWidth;
    [contentView addSubview:button];
}