通过保持边距以编程方式调整UIButton的大小 [英] Resizing a UIButton programmatically by maintaining a margin

问题描述

我正在以编程方式将UIButton添加到tableView页脚中。此按钮的左右边距等于tableView的边距：

I'm adding a UIButton to a tableView footer programmatically. This button has a left and right margin that is equal to the tableView margin:

UIButton *deleteButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

deleteButton.frame = CGRectMake(10, 60, 300, 34);
deleteButton.autoresizingMask = UIViewAutoresizingFlexibleWidth

我要添加autoresizingMask，因为我想支持旋转。但是，它不能按我想要的方式工作，因为该按钮一直向下延伸到右侧，如下图所示。

I'm adding autoresizingMask because I want to support rotation. However, it does not work as I want, as the button stretches all the way down to the right, as shown by the image below.

任何想法如何解决？如果我删除了自动调整大小属性，那么边距是正确的。

Any idea how to fix it? If I remove the autosizing property then the margin is correct.

推荐答案

UITableView 调整视图的大小（以及所有其子视图）由-（UIView *）tableView：（UITableView *）tableView viewForFooterInSection：（NSInteger）section 返回。要解决您的问题，您需要一个包装视图，该视图在不使用自动调整大小的情况下布置 UIButton 的布局。这是这样的 UIView 类的示例实现：

UITableView resizes the view (and all its subviews) returned by - (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section. To fix your issue, you need a wrapper view that layouts your UIButton without using autoresizing. Here’s an example implementation of such an UIView class:

@interface ButtonWrapperView : UIView {
    UIButton *_button;
}

@property (nonatomic, readonly) UIButton *button;

@end


@implementation ButtonWrapperView

@synthesize button = _button;

- (id)init
{
    if ((self = [super initWithFrame:CGRectZero])) {
        _button = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];
        [self addSubview:_button];
    }
    return self;
}

- (void)layoutSubviews
{
    [super layoutSubviews];

    // Layout button
    _button.frame = CGRectMake(10.0f, 0.0f, self.bounds.size.width - 20.0f, self.bounds.size.height);
}

- (void)dealloc
{
    [_button release];
    [super dealloc];
}

@end

在-（UIView *）tableView：（UITableView *）tableView viewForFooterInSection：（NSInteger）部分，您的按钮应正确显示。

Simply return this view in - (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section and your button should be displayed properly.

我还上传了一个示例项目，该项目完全实现了上述解决方案。

I’ve also uploaded a sample project which completely implements the above solution.

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