UISegmentedControl中的两行文本

Question

尽我所能,我无法解决iOS7 iPhone应用程序的UISegmentedControl错误.

当我创建分段控件时,我使用此代码:

NSArray *segmentedControlItemArray = [NSArray arrayWithObjects: @"Nominal:\n27 inch", @"Actual:\n700c x 23mm", @"Actual:\n700c x 20mm", nil];
_wheelDiameterSegmentedControl = [[UISegmentedControl alloc] initWithItems:segmentedControlItemArray];
_wheelDiameterSegmentedControl.frame = CGRectMake(0, 102, 290, 50);
_wheelDiameterSegmentedControl.selectedSegmentIndex = 0;
_wheelDiameterSegmentedControl.tintColor = [UIColor colorWithRed:0.35 green:0.4 blue:0.9 alpha:1.0];

for (id segment in [_wheelDiameterSegmentedControl subviews]) {
    for (id label in [segment subviews]) {
        if ([label isKindOfClass:[UILabel class]]) {
            UILabel *titleLabel = (UILabel *) label;
            titleLabel.numberOfLines = 0;   
        }   
    }  
}

[_wheelDiameterSegmentedControl addTarget:self
                     action:@selector(pickOne:)
           forControlEvents:UIControlEventValueChanged];

[_wheelDiameterMenuContainer addSubview:_wheelDiameterSegmentedControl];

可悲的是,我无法发布图像,或者我会向您展示我想要的控件:UISegmented Control中的每个段都有两行文本,换行符正是我要求它的位置.

但是,在旋转时,我想保持分段控件的全宽度,并且换行在宽段中看起来很傻.因此,在willAnimateRotationToInterfaceOrientation中,我包含了以下代码,字符串中没有换行符:

    [_wheelDiameterSegmentedControl setFrame:CGRectMake(0, 102, 450, 50)];
    [_wheelDiameterSegmentedControl setTitle:@"Nominal: 27 inch" forSegmentAtIndex:0];
    [_wheelDiameterSegmentedControl setTitle:@"Actual: 700c x 23mm" forSegmentAtIndex:1];
    [_wheelDiameterSegmentedControl setTitle:@"Actual: 700c x 20mm" forSegmentAtIndex:2];

再一次,如果我可以插入图像,我会向您展示我想要的图像:一个宽的UISegmented控件,标签中没有换行符(每个标签1行文本).

这是我遇到麻烦的地方.当我旋转回肖像时,我的选择似乎是:

1行标签文本,截断,格式

"实际:7 ......"

当我只是重置UISegmentedControl的大小时

[_wheelDiameterSegmentedControl setFrame:CGRectMake(0, 102, 290, 50)];

2行标签文本,截断,格式

"实际:
700c x ......"

当我重置大小并重置字符串值并重新运行将标签的numberOfLines设置为2的代码循环时,使用

    NSArray *segmentedControlItemArray = [NSArray arrayWithObjects: @"Nominal:\n27 inch", @"Actual:\n700c x 23mm", @"Actual:\n700c x 20mm", nil];

    [_wheelDiameterSegmentedControl setTitle:[segmentedControlItemArray objectAtIndex:0] forSegmentAtIndex:0];
    [_wheelDiameterSegmentedControl setTitle:[segmentedControlItemArray objectAtIndex:1] forSegmentAtIndex:1];
    [_wheelDiameterSegmentedControl setTitle:[segmentedControlItemArray objectAtIndex:2] forSegmentAtIndex:2];
    for (id segment in [_wheelDiameterSegmentedControl subviews]) {
        for (id label in [segment subviews]) {
            if ([label isKindOfClass:[UILabel class]]) {
                UILabel *titleLabel = (UILabel *) label;
                titleLabel.numberOfLines = 2;
            }
        }
    }
    [_wheelDiameterSegmentedControl setFrame:CGRectMake(0, 102, 290, 50)];

3行标签文字,格式

"实际:
700c x
20mm"

这就是我在上面用强制的numberOfLines = 2替换当我在第一时间设置UISegmentedControl时使用的numberOfLines = 0时获得的内容.

我喜欢的是我创建控件时得到的结果

"实际:
700c x 20mm"

但无论我尝试过什么(将字符串和numberOfLines代码放入willRotateToInterfaceOrientation或didRotateFromInterfaceOrientation;在更改文本之前重新设置UISegmentedControl的框架;在更改文本后重新设置框架......),我可以'让我的漂亮,整洁,两线标签回来.我在这里错过了什么？

Answer 1

啊哈!操作系统在旋转时如何处理标签大小的方法与标签在创建时的处理方式不同.所以我强制使用标签框架的大小

for (id segment in [_wheelDiameterSegmentedControl subviews]) {

    for (id label in [segment subviews]) {

        if ([label isKindOfClass:[UILabel class]]) {

            UILabel *titleLabel = (UILabel *) label;

            //inserting line here, to make the frame behave nicely:
            //
            titleLabel.frame = CGRectMake(0, 0, 97, 50);
            //
            //continuing as before

            titleLabel.numberOfLines = 0;

        }
    }
}

现在它显示我想要/期望的完全.好哇!

如果您只想在UISegmentedControl中获取两行(或更多行)文本.使用Herzian的惊人技术!这是另一个代码示例,可以帮助人们......

self.yourSlider .. set the height manually (can't easily do it in XIB)
// now use amazing Herzian technology...
for (id segment in [self.yourSlider subviews])
    for (id label in [segment subviews])
        {
        if ([label isKindOfClass:[UILabel class]])
            {
            UILabel *titleLabel = (UILabel *) label;
            titleLabel .. set the width to say 80, per your layout;
            (the width us typically too low)
            titleLabel.numberOfLines = 0;
            }
        }

再次感谢你.