根据text获取当前label的总行数

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UILabel *label = [[UILabelalloc]initWithFrame:CGRectMake(0,100, SCREENWIDTH, 100)];

label.textColor = [UIColorblackColor];

label.text =@"俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋俊洋洋";

label.font = [UIFontsystemFontOfSize:16];

label.numberOfLines = 0;

[self.viewaddSubview:label];

[label sizeToFit];

CGRect rect = [label.textboundingRectWithSize:CGSizeMake(SCREENWIDTH,MAXFLOAT) options:NSStringDrawingUsesLineFragmentOriginattributes:@{NSFontAttributeName:[UIFontsystemFontOfSize:16]}context:nil];

CGSize textSize = [label.textsizeWithAttributes:@{NSFontAttributeName : [UIFontsystemFontOfSize:16]}];

NSUInteger textRow = (NSUInteger)(rect.size.height / textSize.height);

NSLog(@"fdafafa--%d",textRow);//行数

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