Boundingrectwithsize is used to calculate the uilable height, including emoji and multi-attribute string.

The text height calculation in IOS has been a problem, and Apple has been modifying it. Over the past few days, I have read the boundingrectwithsize method.

- (CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options context:(NSStringDrawingContext *)context NS_AVAILABLE_IOS(6_0);

　　

After several pitfalls, I finally found a better method.

 

Http://stackoverflow.com/questions/13621084/boundingrectwithsize-for-nsattributedstring-returning-wrong-size

Notes for use:

1: Each part of nsattributedstring must have at least two attributes:

Nsfontattributename

Nsforegroundcolorattributename

 

2:

 

 

 

Boundingrectwithsize is used to calculate the uilable height, including emoji and multi-attribute string.