今天遇到一个需求，需要计算label中文字的行数。想了好久也没想到好的解决方法，就在网上找了下。结果发现一篇文章是讲这个的。这部分代码不但能够求出一个label中文字行数，更厉害的是能够求出每一行的内容是什么； 代码如下。
#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; }
文章参照 链接
函数返回的数组的count 即为label中文字行数 ；数组中元素即为某行内容。
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原文地址：http://mingxianwei.github.io/2016/05/27/iOS中求出label中文字的行数和每一行的内容
作者：小土豆