self.contentLabel = [[UILabel alloc] initWithFrame:CGRectMake(15, 45, Main_Screen_Width - 30, 25)];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
// 行间距设置为30
[paragraphStyle setLineSpacing:10];
NSString *testString = @"设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距设置Label的行间距";
NSMutableAttributedString *setString = [[NSMutableAttributedString alloc] initWithString:testString];
[setString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [testString length])];
// 设置Label要显示的text
[self.contentLabel setAttributedText:setString];
To Be Continued...
