- (CGSize)sizeWithFont:(UIFont *

- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(NSLineBreakMode)lineBreakMode ;

这不是一个特别大得问题, 上面这个方法已经报废了.
请用下面的方法代替.
attributes参数需要你对NSParagraphStyle类有一定的了解,点我过去

e.g.

    UIFont *font = [UIFont systemFontOfSize:16.0f];
    CGSize size = CGSizeMake(APPFRAME.size.width - 13.0 * 2, 300);
    
    CGSize labelsize = [content boundingRectWithSize:size
                                             options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
                                          attributes:@{NSFontAttributeName:font}
                                             context:nil].size;