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。
- (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。
转载请注明出处:
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
