如何自定义MPVolumeView？ [英] How to customize MPVolumeView?

问题描述

我已经尝试了很多方法来实现常规的 UISlider 并控制设备卷，但它是所有Native-C函数，导致许多无法追踪的错误。

I have tried many methods to implement a regular UISlider and control the device volume, but it's all Native-C functions which results in many untraceable bugs.

我尝试了 MPVolumeView 它就像魅力一样，甚至在关闭应用程序后甚至可以控制设备音量，就像iPod应用程序一样。

I tried the MPVolumeView it works like charm, it even controls the device volume even after you close the app, just like the iPod app.

我的问题是，无论如何要定制具有特定颜色和图像的 MPVolumeView ，就像 UISlider ？

My question is, is there anyway to customize the MPVolumeView with specific colors and images, just like UISlider?

注意：我想要一个合法的方法而不使用私有的未记录的API。

NOTE: I want a legal method without using private undocumented APIs.

UPDATE

根据@Alexsander Akers的回答，因为子视图隐藏在 MPVolumeView 我不得不循环浏览子视图，获取 UISlider 并自定义它，这是代码。

UPDATE
As per @Alexsander Akers answer, since the sub views are hidden in MPVolumeView I had to cycle through subviews, get the UISlider and customize it, here is the code.

IBOutlet UISlider *volumeSlider;   //defined in <class.h> and connected to a UISlider in Interface Builder

-(void) viewDidLoad {
     ....
     [self setCustomSlider];
     ....
}

-(void) setCustomSlider{
     MPVolumeView *volumeView = [[[MPVolumeView alloc] initWithFrame:[volumeSlider frame]] autorelease];
     NSArray *tempArray = volumeView.subviews;

     for (id current in tempArray){
           if ([current isKindOfClass:[UISlider class]]){
                    UISlider *tempSlider = (UISlider *) current;
                    UIImage *img = [UIImage imageNamed:@"trackImage.png"];
                    img = [img stretchableImageWithLeftCapWidth:5.0 topCapHeight:0];
                    [tempSlider setMinimumTrackImage:img forState:UIControlStateNormal];

                    [tempSlider setThumbImage:[UIImage imageNamed:@"thumbImage.png"] forState:UIControlStateNormal];

           } 
    }
    [volumeSlider removeFromSuperview];
    [self.view addSubview:volumeView];
 }

推荐答案

你可以尝试骑自行车子视图并查找UISlider子类？

You could try cycling through its subviews and look for a UISlider subclass?

这篇关于如何自定义MPVolumeView？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！