Question

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（比如，比其他更宽）。当我setWidth:forSegmentAtIndex:用于标准样式的segmentedControl（即[[UISegmantedControl appearence] setBackgroundImage:forState:barMetrics:]未设置）时，事情就像他们应该的那样。但是当我设置背景图像时，分段宽度不会改变。

这是我的代码：

[[UISegmentedControl appearance] setBackgroundImage:[[UIImage imageNamed:@"btn_normal.png"] stretchableImageWithLeftCapWidth:25 topCapHeight:0] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearance] setBackgroundImage:[[UIImage imageNamed:@"btn_selected.png"]  stretchableImageWithLeftCapWidth:25 topCapHeight:0] forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearance] setDividerImage:[UIImage imageNamed:@"nn.png"] forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearance] setDividerImage:[UIImage imageNamed:@"sn.png"] forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearance] setDividerImage:[UIImage imageNamed:@"ns.png"] forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
[self.segmentedControl setContentMode:UIViewContentModeScaleToFill];
[self.segmentedControl setWidth:100.0 forSegmentAtIndex:0];
[self.segmentedControl setWidth:100.0 forSegmentAtIndex:4];

这样，我的所有片段的大小都会自动调整到相等的宽度当我在上面注释掉所有内容时

[self.segmentedControl setContentMode:UIViewContentModeScaleToFill];
[self.segmentedControl setWidth:100.0 forSegmentAtIndex:0];
[self.segmentedControl setWidth:100.0 forSegmentAtIndex:4];

尺寸设置正确。
这是我的问题：如何使用背景图像设置分段的大小？
我是cocoa-touch和objective-c的新手，所以我可能会遗漏一些东西......
你能帮忙吗？

Answer 1

我认为当您使用 [UISegmentedControl外观] 代理时，它会覆盖“setWidth：forSegmentAtIndex：”方法值。所以可能的解决方案：

1）

[[UISegmentedControl appearance] setContentMode:UIViewContentModeScaleToFill];
[[UISegmentedControl appearance] setWidth:100.0 forSegmentAtIndex:0];
[[UISegmentedControl appearance] setWidth:100.0 forSegmentAtIndex:4];

我不建议使用它，因为它会为您应用中的每个分段控件设置0和4段的自定义宽度。

2）

[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];

如果您需要应用中的所有分段控件都应具有自定义背景，那么我建议您编写自己的代理方法。像这样：

- (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;
}

Answer 2

我通过编写基于此http://idevrecipes.com/2010/12/11/custom-segmented-controls/

的自定义控件解决了这个问题

设置背景图像时，未设置UISegmentedControl段宽度

2 个答案: