计算文字尺寸的分类

NSString+Extension.h

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#import@interface NSString (Extension)

- (CGSize)textSizewithFont:(UIFont *)font andMaxSize:(CGSize)maxSize;

@end

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NSString+Extension.m

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#import "NSString+Extension.h"

@implementation NSString (Extension)

- (CGSize)textSizewithFont:(UIFont *)font andMaxSize:(CGSize)maxSize {

NSDictionary * attr = @{NSFontAttributeName : font};

return [self boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attr context:nil].size;

}

@end

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