- (CGRect)boundingRectWithSize:(

- (CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options attributes:(nullable NSDictionary<NSString *, id> *)attributes context:(nullable NSStringDrawingContext *)context NS_AVAILABLE(10_11, 7_0);

[原文]（http://blog.csdn.net/iunion/article/details/12185077）

http://blog.csdn.net/iunion/article/details/12185077