如何从新 iOS 7 方法 sizeWithAttributes 返回 CGSize 的多行文本？

我想这要产生相同的结果为 sizeWithFont:constrainedToSize。

NSString *text = @"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus eu urna quis lacus imperdiet scelerisque a nec neque. Mauris eget feugiat augue, vitae porttitor mi. Curabitur vitae sollicitudin augue. Donec id sapien eros. Proin consequat tellus in vehicula sagittis. Morbi sed felis a nibh hendrerit hendrerit. Lorem ipsum dolor sit."

CGSize textSize = [text sizeWithAttributes:@{ NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Light" size:16.0] }];

此方法只生成单个文本行的高度。

解决方法 :

NSDictionary *attributes = @{NSFontAttributeName: [UIFont fontWithName:@"HelveticaNeue" size:14]};

// NSString class method: boundingRectWithSize:options:attributes:context is

// available only on ios7.0 sdk.

CGRect rect = [textToMeasure boundingRectWithSize:CGSizeMake(width, MAXFLOAT)

                                              options:NSStringDrawingUsesLineFragmentOrigin

                                           attributes:attributes

                                              context:nil];