IOS calculates the size of a string based on string style, string length

Add a method to NSString by Category:

1. Calculate the size of a string based on string style, string length

/**
* @param font string style
* @param maxWidth Specify string length
*/
-(Cgsize) Sizewithfont: (Uifont *) Font maxWidth: (cgfloat) maxwidth{//Get Text StyleNsmutabledictionary *attrs =[Nsmutabledictionary dictionary]; Attrs[nsfontattributename]=font; //calculate the size of text based on text style//Maximum text widthCgsize maxSize =Cgsizemake (MaxWidth, maxfloat); //Nsstringdrawinguseslinefragmentorigin, start from scratch    return[self boundingrectwithsize:maxsize options:nsstringdrawinguseslinefragmentorigin attributes:attrs Context:nil] . Size;}

2. Calculate the size of a string based on a string style

/**
* @param font string style
*/
-(Cgsize) Sizewithfont: (Uifont *) font{    return  [self Sizewithfont:font maxwidth:maxfloat];}

IOS calculates the size of a string based on string style, string length