uilabel字符串的宽高度

NSString *str=@"你好我是你我是你的号年度卡拉是大家啊啊的可垃圾的垃圾收到了就爱看";
CGSize size= [nal.text sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:16]}];

NSString *str=@"你好我是你我是你的号年度卡拉是大家啊啊的可垃圾的垃圾收到了就爱看";

CGSize size=[self boundingRectWithSize:CGSizeMake(200, CGFLOAT_MAX) withTextFont:[UIFont systemFontOfSize:16] withLineSpacing:0 with:str];

-(CGSize)boundingRectWithSize:(CGSize)size   withTextFont:(UIFont *)font withLineSpacing:(CGFloat)lineSpacing with:(NSString *)usestr{

NSMutableAttributedString *attributedStr=[[NSMutableAttributedString alloc]initWithString:usestr attributes:@{NSFontAttributeName:font}];

NSMutableParagraphStyle *paragraphStyle=[[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:lineSpacing];

[attributedStr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, usestr.length)];

CGSize textSize = [attributedStr boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin context:nil].size;
return textSize;

}

这样应该得到要的宽度和高度了，那个NSMutableParagraphStyle *paragraphStyle现在不太清楚，好像是设置行间距的。希望再次进步。