Object-C_计算UILabel的高度及间隙

1.计算UILabel的高度及间隙

#define UILABEL_LINE_SPACE 6
#define HEIGHT [ [ UIScreen mainScreen ] bounds ].size.height
//给UILabel设置行间距和字间距
-(void)setLabelSpace:(UILabel*)label withValue:(NSString*)str withFont:(UIFont*)font {
    NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStylealloc] init];
    paraStyle.lineBreakMode =NSLineBreakByCharWrapping;
    paraStyle.alignment =NSTextAlignmentLeft;
    paraStyle.lineSpacing = UILABEL_LINE_SPACE; //设置行间距
    paraStyle.hyphenationFactor = 1.0;
    paraStyle.firstLineHeadIndent =0.0;
    paraStyle.paragraphSpacingBefore =0.0;
    paraStyle.headIndent = 0;
    paraStyle.tailIndent = 0;
    //设置字间距 NSKernAttributeName:@1.5f
    NSDictionary *dic =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:@1.5f};
    
    NSAttributedString *attributeStr = [[NSAttributedStringalloc] initWithString:strattributes:dic];
    label.attributedText = attributeStr;
}

//计算UILabel的高度(带有行间距的情况)
-(CGFloat)getSpaceLabelHeight:(NSString*)str withFont:(UIFont*)font withWidth:(CGFloat)width {
    NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStylealloc] init];
    paraStyle.lineBreakMode =NSLineBreakByCharWrapping;
    paraStyle.alignment =NSTextAlignmentLeft;
    paraStyle.lineSpacing = UILABEL_LINE_SPACE;
    paraStyle.hyphenationFactor = 1.0;
    paraStyle.firstLineHeadIndent =0.0;
    paraStyle.paragraphSpacingBefore =0.0;
    paraStyle.headIndent = 0;
    paraStyle.tailIndent = 0;
    NSDictionary *dic =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:@1.5f};
    
    CGSize size = [strboundingRectWithSize:CGSizeMake(width,HEIGHT) options:NSStringDrawingUsesLineFragmentOriginattributes:dic context:nil].size;
    return size.height;
}