[英]Multiline UILabel with padding in autolayout, in UITableView
我在UITableView中有一個UILabel,它最多應該有2行,並且周圍有一些填充(左右7個,頂部和底部2個)。 我正在使用自動布局,僅針對iOS6及更高版本。 正在以編程方式創建和添加所有視圖。
我已經將我的UILabel子類化了,這是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,我得到正確的填充,但它只是一行:
- (void)drawTextInRect:(CGRect)rect {
UIEdgeInsets insets = {2, 7, 2, 7};
return [super drawTextInRect:UIEdgeInsetsInsetRect(rect, insets)];
}
我已經看過幾次這個答案,但它對我不起作用(沒有效果):
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines
{
UIEdgeInsets insets = {2, 7, 2, 7};
return [super textRectForBounds:UIEdgeInsetsInsetRect(bounds,insets) limitedToNumberOfLines:numberOfLines];
}
它是否在表視圖中有所不同? 任何幫助,將不勝感激。
正如你在上面的評論中所看到的,你並沒有真正說出你沒想到的是什么。 我剛剛完成了這個,這適用於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
@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];
}
這工作甚至更好imho。
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