iOS－UILabel的寬度,高度自適應文字

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UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
    [label setNumberOfLines:0];
    label.text = @"自適應文本你說行不行自適應文本你說行不行自適應文本你說行不行自適應文本你說行不行自適應文本你說行不行";
    label.backgroundColor = [UIColor orangeColor];
    label.font = [UIFont systemFontOfSize:15.0];;

    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
    NSDictionary *attributes = @{NSFontAttributeName:label.font, NSParagraphStyleAttributeName:paragraphStyle.copy};

   CGSize labelsize = [label.text boundingRectWithSize:CGSizeMake(320, 999) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size;

    [label setFrame:CGRectMake(0, 110, labelsize.width, labelsize.height)];
    [self.view addSubview:label];(https://img-blog.csdn.net/20150327150109525)(https://img-blog.csdn.net/20150327150014161)