ios - sizeWithFont：替换

Question

以下 NSString 方法在 iOS 7 中已被弃用：

    - (CGSize)sizeWithFont:(UIFont *)font NS_DEPRECATED_IOS(2_0, 7_0, "Use -sizeWithAttributes:");

    - (CGSize)sizeWithFont:(UIFont *)font forWidth:(CGFloat)width lineBreakMode:
(NSLineBreakMode)lineBreakMode NS_DEPRECATED_IOS(2_0, 7_0, "Use -boundingRectWithSize:options:attributes:context:");

    - (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size NS_DEPRECATED_IOS(2_0, 7_0, "Use -boundingRectWithSize:options:attributes:context:");

    - (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(NSLineBreakMode)lineBreakMode NS_DEPRECATED_IOS(2_0, 7_0, "Use -boundingRectWithSize:options:attributes:context:"); 

虽然第一个的替换很简单，但其余的不是那么多。boundingRectWithSize:options:attributes:context:获得完全相同结果的等效调用是什么？

尤其是：

• 的值应该是options多少？
• 你如何指定lineBreakMode？

Answer 1

.如何指定 lineBreakMode？

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineBreakMode:NSLineBreakByTruncatingTail];
[attributedStr addAttribute:NSParagraphStyleAttributeName
                 value:paragraphStyle
                 range:NSMakeRange(0,[attributedStr length])];

Answer 2

添加这个

UIFont *font = [UIFont boldSystemFontOfSize:16];
CGRect new = [string boundingRectWithSize:CGSizeMake(200, 300) options:NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName: font} context:nil];
CGSize stringSize= new.size;