0108-－/** * 根据最大尺寸和字体计算文字的实际尺寸 */

1. .h

2. #import <UIKit/UIKit.h>

    

   @interface NSString (Extension)

   /**

    *  根据最大尺寸和字体计算文字的实际尺寸

    */

   - (CGSize) sizeWithMaxSize:(CGSize) maxSize andFont:(UIFont *) font;

    

   @end

3. .m

4.  #import "NSString+Extension.h"

    @implementation NSString (Extension)

    - (CGSize)sizeWithMaxSize:(CGSize)maxSize andFont:(UIFont *)font

   {

      return  [self boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font} context:nil].size;

   }

    @end

5. 例子：

6. //  计算文本按钮的frame

   //  先计算文本所占大小

       CGFloat maxTextW = screenW - iconW - margin * 3 - textPadding * 2;

       CGSize maxSize = CGSizeMake(maxTextW, CGFLOAT_MAX);

   //  字体

       CGSize textSize = [message.text sizeWithMaxSize:maxSize andFont:textFont];

    

12. 2016 01 19  

13. -(CGSize)checTheStringWithHight:(NSString *)theStr font:(float)font
    {
    // CGSize titleSize = [theStr sizeWithFont:[UIFont systemFontOfSize:font] constrainedToSize:CGSizeMake(SCREEN_WIDTH-40, MAXFLOAT) lineBreakMode:NSLineBreakByCharWrapping];
    //
    //
    
    
    // return titleSize;
    
    CGSize sixx= [theStr boundingRectWithSize:CGSizeMake(SCREEN_WIDTH-40, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:font]} context:nil].size;
    return sixx;

    }

14.