自動計算UILabel的寬度或則高度

CGFloat mapLableWidth =[[NSString stringWithFormat:@"項目位置:%@",[[NSUserDefaults standardUserDefaults] objectForKey:@"DetailEnlargeAddress"]] boundingRectWithSize:CGSizeMake(self.frame.size.width - 80*HomePageDefineWidth, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:15*HomePageDefineWidth]} context:nil].size.width;