截取固定宽度字符串

#import <CoreText/>
/// 截取固定宽度字符串
- (NSString *)getVisibleStringWithWidth:(CGFloat)width font:(UIFont *)font str:(NSString*)str {
    NSMutableParagraphStyle *p = [[NSMutableParagraphStyle alloc] init];
     = NSLineBreakByCharWrapping;
    NSAttributedString *namesAtt = [[NSAttributedString alloc] initWithString:str attributes:@{NSFontAttributeName:font, NSParagraphStyleAttributeName:p}];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)namesAtt);
    UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, width, 25.)];
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, ), , NULL);
    CFRange range = CTFrameGetVisibleStringRange(frame);
    CFRelease(framesetter);
    CFRelease(frame);
    return [str substringWithRange:NSMakeRange(, )];
}

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使用

 CGSize size = [ danamicGetWidthFromTextWithFont:[Apperance ChineseFontMediumSize:14]];
    float total =  + DeviceX(12) + DeviceX(60);
    if(total>DeviceX(283)){
        float maxWidth = DeviceX(283) - DeviceX(12) - DeviceX(60) - DeviceX(15);
        NSString *newStr = [self getVisibleStringWithWidth:maxWidth font:[LCApperance LCChineseFontMediumSize:14] str:];
         = [NSString stringWithFormat:@"%@...",newStr];
    }

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