iOS UILabel添加UIEdgeInsets，抗拉伸和抗压缩

UILabel添加UIEdgeInsets

@interface WSFLabel : UILabel

@property (nonatomic, assign) UIEdgeInsets edgeInsets;

@end

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.edgeInsets = UIEdgeInsetsMake(8, 8+2, 8, 8+2);
    }
    return self;
}

- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines {
    UIEdgeInsets insets = self.edgeInsets;
    CGRect rect = [super textRectForBounds:UIEdgeInsetsInsetRect(bounds, insets) limitedToNumberOfLines:numberOfLines];
    
    rect.origin.x    -= insets.left;
    rect.origin.y    -= insets.top;
    rect.size.width  += (insets.left + insets.right);
    rect.size.height += (insets.top + insets.bottom);
    
    return rect;
}

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

UILabel自适应高度

label.lineBreakMode = NSLineBreakByWordWrapping;
label.numberOfLines = 0;

UILabel自适应宽度

[label setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];

抗拉伸和抗压缩

// 抗被拉伸
[self.label setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];
// 抗被压缩
[self.label setContentCompressionResistancePriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];