这个是计算普通字符串的....NSString的!
- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(NSLineBreakMode)lineBreakMode NS_DEPRECATED_IOS(2_0, 7_0, "Use -boundingRectWithSize:options:attributes:context:"); // NSTextAlignment is not needed to determine size
而带有行间距的字符串是NSAttributedString, 属性字符串,比NSString 多出了很多属性
- (CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options attributes:(NSDictionary *)attributes context:(NSStringDrawingContext *)context NS_AVAILABLE_IOS(7_0);
这样 就不用计算别的其他东西了...
补充,自己闲着没事,就封装了一个方法...欢迎大家使用:
#pragma mark - 计算cell高度 str 字符串长度 typefaceName字体内容 typefaceSize字体大小 scopeWidth显示范围的宽 scopeHeight显示范围的高
- (NSInteger )HeightStr:(NSString *)str typefaceName:(NSString *)typefaceName typefaceSize:(NSInteger)typefaceSize scopeWidth:(NSInteger)scopeWidth scopeHeight:(NSInteger)scopeHeight
{
NSDictionary * dic = [NSDictionary dictionary];
//1.获得要显示的文本 str
NSString * CellStr = str;
//计算高度
if (typefaceName == nil) {
dic = @{NSFontAttributeName:[UIFont systemFontOfSize:typefaceSize]};
}else{
//字体类型 大小
dic = @{NSFontAttributeName:[UIFont fontWithName:typefaceName size:typefaceSize]};
}
//字符串的显示范围
CGSize scope = CGSizeMake(scopeWidth, scopeHeight);
CGRect rect = [CellStr boundingRectWithSize:scope options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil];
int cellH = rect.size.height + 20;
return cellH;
}
