ios - 替换已弃用的 -sizeWithFont :constrainedToSize:lineBreakMode: in iOS 7?

Question

在 iOS 7 中，方法:

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

和方法:

- (CGSize)sizeWithFont:(UIFont *)font

已弃用。我怎样才能更换

CGSize size = [string sizeWithFont:font
                 constrainedToSize:constrainSize
                     lineBreakMode:NSLineBreakByWordWrapping];

和:

CGSize size = [string sizeWithFont:font];

Answer 1

你可以试试这个:

CGRect textRect = [text boundingRectWithSize:size
                                 options:NSStringDrawingUsesLineFragmentOrigin
                              attributes:@{NSFontAttributeName:FONT}
                                 context:nil];

CGSize size = textRect.size;

只需将“FONT”更改为“[UIFont font....]”