iOS动态计算Label的宽高

1.根据文字计算Label的宽度

1 +(CGFloat)widthOfString:(NSString *)string font:(UIFont *)font height:(CGFloat)height
2 {
3     NSDictionary * dict=[NSDictionary dictionaryWithObject: font forKey:NSFontAttributeName];
4     CGRect rect=[string boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, height) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil];
5     return rect.size.width;
6 }

2.根据文字计算Label的高度

2.1方法一:sizeThatFits

例如:CGSize size = [toolLabel sizeThatFits:CGSizeMake([UIScreen mainScreen].bounds.size.width, MAXFLOAT)];

得到的size.height就是Label的高度

2.2方法二:

+(CGFloat)heightOfString:(NSString *)string font:(UIFont *)font width:(CGFloat)width
{
    CGRect bounds;
    NSDictionary * parameterDict=[NSDictionary dictionaryWithObject:font forKey:NSFontAttributeName];
    bounds=[string boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:parameterDict context:nil];
    return bounds.size.height;
}