在iOS 7中替换已弃用的-sizeWithFont：constrainedToSize：

Question

在iOS 7中，方法：

- (CGSize)sizeWithFont:(UIFont *)font

     constrainedToSize:(CGSize)size

         lineBreakMode:(NSLineBreakMode)lineBreakMode 

和方法：

- (CGSize)sizeWithFont:(UIFont *)font

不推荐使用。我该如何更换

CGSize size = [string sizeWithFont:font

                 constrainedToSize:constrainSize

                     lineBreakMode:NSLineBreakByWordWrapping];

和：

CGSize size = [string sizeWithFont:font];

Answer 1

您可以尝试以下方法：CGRect textRect = [text boundingRectWithSize:size                                 options:NSStringDrawingUsesLineFragmentOrigin                              attributes:@{NSFontAttributeName:FONT}                                 context:nil];CGSize size = textRect.size;只需将“ FONT”更改为“ [UIFont字体。...]”

Answer 2

这是简单的解决方案：要求 ：CGSize maximumSize = CGSizeMake(widthHere, MAXFLOAT);UIFont *font = [UIFont systemFontOfSize:sizeHere];现在constrainedToSizeusage:lineBreakMode:在iOS 7.0中已弃用用法：CGSize expectedSize = [stringHere sizeWithFont:font constrainedToSize:maximumSize lineBreakMode:NSLineBreakByWordWrapping];现在，在更高版本的iOS 7.0中的用法将是：// Let's make an NSAttributedString firstNSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:stringHere];//Add LineBreakModeNSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new];[paragraphStyle setLineBreakMode:NSLineBreakByWordWrapping];[attributedString setAttributes:@{NSParagraphStyleAttributeName:paragraphStyle} range:NSMakeRange(0, attributedString.length)];// Add Font[attributedString setAttributes:@{NSFontAttributeName:font} range:NSMakeRange(0, attributedString.length)];//Now let's make the Bounding RectCGSize expectedSize = [attributedString boundingRectWithSize:maximumSize options:NSStringDrawingUsesLineFragmentOrigin context:nil].size;