iOS每日一记之-------------------获取label的行数。。。。。恩

-(NSArray *)getSeparatedLinesFromLabel {

NSString *text = [self text];

UIFont *font = [self font];

CGRect rect = [self frame];

CTFontRef myFont = CTFontCreateWithName((__bridge 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)];

CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString((__bridge 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 = (__bridge 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];

[linesArray addObject:lineString];

}

return (NSArray *)linesArray;

}