IOS7 中不推荐使用 SizeWithFont答案

【问题标题】：SizeWithFont deprecated in IOS7IOS7 中不推荐使用 SizeWithFont
【发布时间】：2014-11-03 05:46:45
【问题描述】：

如何改变

CGSize size=[tempStr sizeWithFont:[UIFont boldSystemFontOfSize:17]  constrainedToSize:CGSizeMake(200, 56)];

使其适用于 IOS7

【问题讨论】：

见stackoverflow.com/questions/18897896/…

标签： objective-c ios7

【解决方案1】：

您必须使用sizeWithAttributes:，例如：

UIFont *font = [UIFont boldSystemFontOfSize:17.0f];
NSDictionary *attrsDictionary = [NSDictionary dictionaryWithObject:font forKey:NSFontAttributeName];
CGSize size = [tempStrig sizeWithAttributes:attrDictionary];

【讨论】：

【解决方案2】：

    CGFloat finalHeight;

    CGSize constrainedSize = CGSizeMake(requiredWidth,9999);

    NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:yourRequiredFont, NSFontAttributeName,nil];

    NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:yourText attributes:attributesDictionary];

    CGRect requiredHeight = [string boundingRectWithSize:constrainedSize options:NSStringDrawingUsesLineFragmentOrigin context:nil];

    if (requiredHeight.size.width > requiredWidth) {
        requiredHeight = CGRectMake(0,0,requiredWidth, requiredHeight.size.height);
    }

    finalHeight=requiredHeight.size.height;

【讨论】：