对Label的间隔行距进行的更改并计算高度

对于ios系统自带的Label显示的字体都是比较紧凑的并且行间距是比较难以控制的、下面里那个方法是对行距还有字间距的修改 ，并且计算出所修改个行间距

#define UILABEL_LINE_SPACE 6*Ratio
#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 = [[NSMutableParagraphStyle alloc] 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 = [[NSAttributedString alloc] initWithString:str attributes: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 = [[NSMutableParagraphStyle alloc] 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 = [str boundingRectWithSize:CGSizeMake(width, HEIGHT) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;

return size.height;

}