tipLabel = [[UILabel alloc] init];
[self.backScrollView addSubview:tipLabel];
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
[style setLineSpacing:10];
NSString *tipStr = @"温馨提示：这是要计算高度的字符串";
NSDictionary *dic = @{NSFontAttributeName:kSystemFont_16, NSParagraphStyleAttributeName:style};
NSAttributedString *attributeStr = [[NSAttributedString alloc] initWithString:tipStr attributes:dic];
tipLabel.attributedText = attributeStr;
tipLabel.numberOfLines = 0;
CGFloat height = [self getHeightLineWithString:tipStr withWidth:kDeviceWidth - 20 withFont:kSystemFont_16];
tipLabel.frame = CGRectMake(10, topHeight + 300, kDeviceWidth - 20, height);
#pragma mark - 根据字符串计算label高度
- (CGFloat)getHeightLineWithString:(NSString *)string withWidth:(CGFloat)width withFont:(UIFont *)font {
//1.1最大允许绘制的文本范围
CGSize size = CGSizeMake(width, 2000);
//1.2配置计算时的行截取方法,和contentLabel对应
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
[style setLineSpacing:10];
//1.3配置计算时的字体的大小
//1.4配置属性字典
NSDictionary *dic = @{NSFontAttributeName:font, NSParagraphStyleAttributeName:style};
//2.计算
//如果想保留多个枚举值,则枚举值中间加按位或|即可,并不是所有的枚举类型都可以按位或,只有枚举值的赋值中有左移运算符时才可以
CGFloat height = [string boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:dic context:nil].size.height;
return height;
}
