Swift - UILabel 自动调整为文本长度

Question

正如之前多次提到的，label.sizeToFit() 和 label.numberOfLines=0 都不适合我。一直以来，我都得到相同高度的标签，文本以“…”结尾。

我真的想保持标签宽度不变且高度可调节，但我在论坛上找到的任何解决方案都不适合我。我知道最好将其作为对现有问题的评论提出，但不幸的是，由于我的观点，我无法这样做。

你知道其他实现UILabel高度可调的方法吗？

这是我所拥有的：

    cell.restaurantName.setTranslatesAutoresizingMaskIntoConstraints(false)
    cell.restaurantName.numberOfLines = 0
    cell.restaurantName.sizeThatFits(CGSizeMake(CGFloat(172.0),    CGFloat(MAXFLOAT)))

然后我尝试了与下面发布的完全相同

cell.restaurantName.numberOfLines = 0
cell.restaurantName.sizeToFit()

对宽度有限制

我再次看到带有三个点的文本

提前致谢

Answer 1

最简单的解决方案是创建标签，将标签添加到视图中，然后设置约束。只要以这样一种方式设置水平约束，标签就知道它的最大宽度可以是多少，那么您就可以为标签调用 sizeThatFits，这样它就可以正确下载大小。下面是一些 Objective C 代码，它们将完全满足您的需求。

UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero];
label.translatesAutoresizingMaskIntoConstraints = NO;
label.numberOfLines = 0;
label.text = @"Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.";
[self.view addSubview:label];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|-(10)-[label(300)]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(label)]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(10)-[label]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(label)]];
[label sizeThatFits:CGSizeMake(300.0, MAXFLOAT)];

标签的宽度最大为 300，其余的高度取决于 UILabel 中的文本内容

因为这是一个快速的问题，所以这里的答案是一样的 swift

var label: UILabel = UILabel(frame: CGRectZero)
label.setTranslatesAutoresizingMaskIntoConstraints(false)
label.numberOfLines = 0
label.text = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum."
view.addSubview(label)

let views = Dictionary(dictionaryLiteral: ("label", label))
view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|-(10)-[label(300)]", options: NSLayoutFormatOptions(0), metrics: nil, views: views))
view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-(10)-[label]", options: NSLayoutFormatOptions(0), metrics: nil, views: views))
label.sizeThatFits(CGSizeMake(CGFloat(300.0), CGFloat(MAXFLOAT)))

使用情节提要，您只需执行以下操作：

 @interface ViewController ()

@property (nonatomic, weak) IBOutlet UILabel *label;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.label.numberOfLines = 0;
    self.label.text = @"Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.";
    [self.label sizeToFit];
}

@end