iphone - iOS 7-自定义UISlider设计不起作用

在先前版本的iOS上，一切正常，但在iOS 7上却无法正常工作。
它没有为UISlider设置自定义设计，因此视图上没有任何内容，“音量”滑块视图为空。其他一切正常。

码:

for (UISlider *slider in volumeSlider.subviews) {
        NSLog(@"Searching!");
        if ([slider isKindOfClass:[UISlider class]]) {
            NSLog(@"SLIDER FOUND!");
            [slider setThumbImage:[UIImage imageNamed:@"thumbSlider.png"] forState:UIControlStateNormal];
            [slider setMinimumTrackImage:[[UIImage imageNamed:@"sliderMax.png"] stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0] forState:UIControlStateNormal ];
            [slider setMaximumTrackImage:[[UIImage imageNamed:@"sliderMin.png"] stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0] forState:UIControlStateNormal ];
        }
    }

最佳答案

iOS7现在已发布，因此NDA不再适用。如果您需要支持低于iOS6的操作系统，则可以使用此代码。这也适用于iOS7。注意:如果您只需要支持iOS6和更高版本，Apple提供了直接API来设置这些图像以自定义MPVolumeView的外观，特别是setVolumeThumbImage:(UIImage *)forState:(UIControlState)，setMinimumVolumeSliderImage:(UIImage *)forState :(UIControlState)和setMaximumVolumeSliderImage:(UIImage *)forState:(UIControlState)。

// replace the standard look and feel for the MPVolumeSlider with custom images
// note: on iOS7 it is necessary to set the thumb image last or the thumb will be drawn under the slider (not pretty), on iOS6 the order didn't seem to matter.
UIView *a = nil;
for (UIView *view in [self.volumeView subviews]) {
    if ([[[view class] description] isEqualToString:@"MPVolumeSlider"]) {
        a=view;
        UIImage *volumeBackgroundImage = [[UIImage imageNamed:@"volume_background"] resizableImageWithCapInsets:UIEdgeInsetsMake(9, 5, 7, 5)];
        [(UISlider *)a setMinimumTrackImage:[[UIImage imageNamed:[[ApplicationType sharedInstance] imageForAppType:@"volume_progress"]] resizableImageWithCapInsets:UIEdgeInsetsMake(9, 5, 7, 5)]  forState:UIControlStateNormal];
        [(UISlider *)a setMaximumTrackImage:volumeBackgroundImage forState:UIControlStateNormal];
        [(UISlider *)a setThumbImage:[UIImage imageNamed:@"volume_handle"] forState:UIControlStateNormal];
    }
}

关于iphone - iOS 7-自定义UISlider设计不起作用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/18821000/