針對一些設(shè)置了富文本樣式的label，獲取高度有點麻煩呛伴，不能直接按每行的高度除勃痴，因為可能會有行間距谒所，會影響計算。找到篇相關(guān)博客：原博鏈接??

今天遇到一個需求沛申，需要計算label中文字的行數(shù)劣领。想了好久也沒想到好的解決方法，就在網(wǎng)上找了下铁材。結(jié)果發(fā)現(xiàn)一篇文章是講這個的剖踊。這部分代碼不但能夠求出一個label中文字行數(shù)，更厲害的是能夠求出每一行的內(nèi)容是什么衫贬； 代碼如下。

#import <CoreText/CoreText.h>

- (NSArray *)getLinesArrayOfStringInLabel:(UILabel *)label{
    NSString *text = [label text];
    UIFont *font = [label font];
    CGRect rect = [label frame];

    CTFontRef myFont = CTFontCreateWithName(( CFStringRef)([font fontName]), [font pointSize], NULL);
    NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:text];
    [attStr addAttribute:(NSString *)kCTFontAttributeName value:(__bridge  id)myFont range:NSMakeRange(0, attStr.length)];
    CFRelease(myFont);
    CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString(( CFAttributedStringRef)attStr);
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddRect(path, NULL, CGRectMake(0,0,rect.size.width,100000));
    CTFrameRef frame = CTFramesetterCreateFrame(frameSetter, CFRangeMake(0, 0), path, NULL);
    NSArray *lines = ( NSArray *)CTFrameGetLines(frame);
    NSMutableArray *linesArray = [[NSMutableArray alloc]init];
    for (id line in lines) {
        CTLineRef lineRef = (__bridge  CTLineRef )line;
        CFRange lineRange = CTLineGetStringRange(lineRef);
        NSRange range = NSMakeRange(lineRange.location, lineRange.length);
        NSString *lineString = [text substringWithRange:range];
        CFAttributedStringSetAttribute((CFMutableAttributedStringRef)attStr, lineRange, kCTKernAttributeName, (CFTypeRef)([NSNumber numberWithFloat:0.0]));
        CFAttributedStringSetAttribute((CFMutableAttributedStringRef)attStr, lineRange, kCTKernAttributeName, (CFTypeRef)([NSNumber numberWithInt:0.0]));
        //NSLog(@"''''''''''''''''''%@",lineString);
        [linesArray addObject:lineString];
    }

    CGPathRelease(path);
    CFRelease( frame );
    CFRelease(frameSetter);
    return (NSArray *)linesArray;
}

轉(zhuǎn)載請注明原博出處：

原文地址：https://www.cnblogs.com/tangyuanby2/p/7091203.html