Objective c 设置背景图像时，未设置的UISegmentedControl段宽度

我有一个分段控件，我希望第一个和最后一个项具有指定的宽度（例如，比其他项宽）。当我为标准样式的分段控件（即

[[UISegmantedControl appearance]setBackgroundImage:forState:barMetrics:

未设置）设置宽度：forSegmentAtIndex:时，事情会按其应有的方式运行。但当我设置背景图像时，分段宽度并没有改变

这是我的密码：

[[UISegmentedControl外观]setBackgroundImage:[[UIImage ImageName:@“btn_normal.png”]StretcableImageWithLeftCapWidth:25 topCapHeight:0]用于状态：UIControlStateNormal barMetrics:UIBarMetricsDefault]；
[[UISegmentedControl外观]setBackgroundImage:[UIImage ImageName:@“btn_selected.png”]StretcableImageWithLeftCapWidth:25 topCapHeight:0]用于状态：UIControlStateSelected barMetrics:UIBarMetricsDefault]；
[[UISegmentedControl外观]setDividerImage:[UIImage ImageName:@“nn.png”]forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault]；
[[UISegmentedControl外观]setDividerImage:[UIImage ImageName:@“sn.png”]forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault]；
[[UISegmentedControl外观]setDividerImage:[UIImage ImageName:@“ns.png”]forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault]；
[self.segmentedControl setContentMode:UIViewContentModeScaleToFill]；
[self.segmentedcontrolsetwidth:100.0表示分段索引：0]；
[self.segmentedcontrolsetwidth:100.0表示分段索引：4]；

这样，我的所有片段都会自动调整为相同的宽度。
当我把这一切都说出来的时候

[self.segmentedControl setContentMode:UIViewContentModeScaleToFill]；
[self.segmentedcontrolsetwidth:100.0表示分段索引：0]；
[self.segmentedcontrolsetwidth:100.0表示分段索引：4]；

尺寸设置正确。
我的问题是：如何设置背景图像片段的大小？
我不熟悉cocoa touch和objective-c，所以我可能遗漏了一些东西…

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您能帮忙吗？

我想当您使用[UISegmentedControl外观]代理时，它会覆盖“setWidth:forSegmentAtIndex:”方法值。因此，可能的解决办法：

(一)

我不建议使用它，因为它将为应用程序中的每个分段控件设置0和4个分段的自定义宽度

(二)

如果您需要应用程序中的所有分段控件都具有自定义背景，那么我建议您编写自己的代理方法。大概是这样的：

- (UISegmentedControl *) customSegmentedControl {
    UISegmentedControl *segmentedControl = [ [ [UISegmentedControl alloc] init] autorelease];

    [segmentedControl setBackgroundImage: [ [UIImage imageNamed: @"btn_normal.png"] stretchableImageWithLeftCapWidth: 25 topCapHeight: 0] forState: UIControlStateNormal barMetrics: UIBarMetricsDefault];
    [segmentedControl setBackgroundImage: [ [UIImage imageNamed: @"btn_selected.png"] stretchableImageWithLeftCapWidth: 25 topCapHeight: 0] forState: UIControlStateSelected barMetrics: UIBarMetricsDefault];
    [segmentedControl setDividerImage: [UIImage imageNamed: @"nn.png"] forLeftSegmentState: UIControlStateNormal rightSegmentState: UIControlStateNormal barMetrics: UIBarMetricsDefault];
    [segmentedControl setDividerImage: [UIImage imageNamed: @"sn.png"] forLeftSegmentState: UIControlStateSelected rightSegmentState: UIControlStateNormal barMetrics: UIBarMetricsDefault];
    [segmentedControl setDividerImage: [UIImage imageNamed: @"ns.png"] forLeftSegmentState: UIControlStateNormal rightSegmentState: UIControlStateSelected barMetrics: UIBarMetricsDefault];

    return segmentedControl;
}

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我通过编写自定义控件解决了这个问题，基于此

谢谢你，Igor！但我的问题是关于细分市场的规模。我通过编写自定义控件解决了这个问题。@voiger，Igor是对的。通过在实际实例而不是外观实例上设置背景图像，可以在各个分段上设置宽度。只有通过外观应用背景图像时，才会忽略指定的宽度。这似乎在iOS 6.0中已经修复，因此目前只有iOS 5.0中出现了故障。

[self.segmentedControl setBackgroundImage:[[UIImage imageNamed:@"btn_normal.png"] stretchableImageWithLeftCapWidth:25 topCapHeight:0] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[self.segmentedControl setBackgroundImage:[[UIImage imageNamed:@"btn_selected.png"]  stretchableImageWithLeftCapWidth:25 topCapHeight:0] forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
[self.segmentedControl setDividerImage:[UIImage imageNamed:@"nn.png"] forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[self.segmentedControl setDividerImage:[UIImage imageNamed:@"sn.png"] forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[self.segmentedControl setDividerImage:[UIImage imageNamed:@"ns.png"] forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault];

- (UISegmentedControl *) customSegmentedControl {
    UISegmentedControl *segmentedControl = [ [ [UISegmentedControl alloc] init] autorelease];

    [segmentedControl setBackgroundImage: [ [UIImage imageNamed: @"btn_normal.png"] stretchableImageWithLeftCapWidth: 25 topCapHeight: 0] forState: UIControlStateNormal barMetrics: UIBarMetricsDefault];
    [segmentedControl setBackgroundImage: [ [UIImage imageNamed: @"btn_selected.png"] stretchableImageWithLeftCapWidth: 25 topCapHeight: 0] forState: UIControlStateSelected barMetrics: UIBarMetricsDefault];
    [segmentedControl setDividerImage: [UIImage imageNamed: @"nn.png"] forLeftSegmentState: UIControlStateNormal rightSegmentState: UIControlStateNormal barMetrics: UIBarMetricsDefault];
    [segmentedControl setDividerImage: [UIImage imageNamed: @"sn.png"] forLeftSegmentState: UIControlStateSelected rightSegmentState: UIControlStateNormal barMetrics: UIBarMetricsDefault];
    [segmentedControl setDividerImage: [UIImage imageNamed: @"ns.png"] forLeftSegmentState: UIControlStateNormal rightSegmentState: UIControlStateSelected barMetrics: UIBarMetricsDefault];

    return segmentedControl;
}