Question

我在UITableView中有一个UILabel，最多应该有两行，并且周围有一些填充（左右7个，顶部和底部2个）。我正在使用自动布局，仅针对iOS6及更高版本。所有视图都以编程方式创建和添加。

我已经将我的UILabel子类化了，这是init方法：

- (id)init
{
self = [super init];

self.translatesAutoresizingMaskIntoConstraints = NO;
self.numberOfLines = 2;
self.backgroundColor = UIColorFromARGB(0x99000000);
self.textColor = [UIColor whiteColor];
self.font = [UIFont boldSystemFontOfSize:14.0f];

return self;
}

如果我添加它，我得到正确的填充，但它只使它成为一行：

- (void)drawTextInRect:(CGRect)rect {
UIEdgeInsets insets = {2, 7, 2, 7};
return [super drawTextInRect:UIEdgeInsetsInsetRect(rect, insets)];
}

我已经看过几次这个答案，但它对我不起作用（没有效果）：

- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines
{
UIEdgeInsets insets = {2, 7, 2, 7};
    return [super textRectForBounds:UIEdgeInsetsInsetRect(bounds,insets) limitedToNumberOfLines:numberOfLines];
}

它是否在表视图中有所不同？任何帮助将不胜感激。

Answer 1

正如你在上面的评论中所看到的那样，你并没有真正说出你没想到的是什么。我自己就是这样做的，这适用于autolayout：

@implementation InsetLabel

- (void) setInsets:(UIEdgeInsets)insets
    {
    _insets = insets ;
    [self invalidateIntrinsicContentSize] ;
    }

- (void)drawTextInRect:(CGRect)rect
    {
    return [super drawTextInRect:UIEdgeInsetsInsetRect(rect, self.insets)];
    }

- (void)resizeHeightToFitText
    {
    CGRect frame = [self bounds];
    CGFloat textWidth = frame.size.width - (self.insets.left + self.insets.right);

    CGSize newSize = [self.text sizeWithFont:self.font constrainedToSize:CGSizeMake(textWidth, 1000000) lineBreakMode:self.lineBreakMode];
    frame.size.height = newSize.height + self.insets.top + self.insets.bottom;
    self.frame = frame;
    }

- (CGSize) intrinsicContentSize
    {
    CGSize superSize = [super intrinsicContentSize] ;
    superSize.height += self.insets.top + self.insets.bottom ;
    superSize.width += self.insets.left + self.insets.right ;
    return superSize ;
    }

@end

Answer 2

@implementation InsetLabel

- (void) setInsets:(UIEdgeInsets)insets
    {
    _insets = insets ;
    [self invalidateIntrinsicContentSize] ;
    }

- (void)drawTextInRect:(CGRect)rect
    {
    return [super drawTextInRect:UIEdgeInsetsInsetRect(rect, self.insets)];
    }

- (void)resizeHeightToFitText
    {
    CGRect frame = [self frame];
    CGFloat textWidth = frame.size.width - (self.insets.left + self.insets.right);

    CGSize newSize = [self.text sizeWithFont:self.font constrainedToSize:CGSizeMake(textWidth, 1000000) lineBreakMode:self.lineBreakMode];
    frame.size.height = newSize.height + self.insets.top + self.insets.bottom;
    self.frame = frame;
    }

- (CGSize) intrinsicContentSize
    {
    CGSize superSize = [super intrinsicContentSize] ;
    superSize.height += self.insets.top + self.insets.bottom ;
    superSize.width += self.insets.left + self.insets.right ;
    return superSize ;
    }
- (void)layoutSubviews
{
    [super layoutSubviews];
    [self resizeHeightToFitText];
}

这样做的效果更好。

在UITableView中，自动布局中带有填充的多行UILabel

2 个答案: