如何在Airplay处于活动状态时自定义Airplay按钮 [英] How to customize the Airplay button when airplay is active
问题描述
现在试图解决这个问题2天，我放弃了。我试图实现一个定制的airplay按钮（我必须beacuse的背景是白色的，按钮必须是黑色的）。 Ive在interfacebuilder中添加了一个视图，并为它选择了mpVolumeView。然后我做了连接并写下面的代码;
Been trying to solve this issue for 2 days now and I give up. Im trying to implement a customized airplay button (I have to beacuse the background is white and the button must be black). Ive added a view in interfacebuilder and chose mpVolumeView for it. Then I made the connections and wrote the following code;
viewDidLoad.. {
.....
[_volumeView setShowsVolumeSlider:NO];
for (UIButton *button in _volumeView.subviews) {
if ([button isKindOfClass:[UIButton class]]) {
[button setImage:[UIImage imageNamed:@"airplay_icon.png"] forState:UIControlStateNormal];
[button addObserver:self forKeyPath:@"alpha" options:NSKeyValueObservingOptionNew context:nil];
[button addTarget:self action:@selector(switchAirplayButton) forControlEvents:UIControlEventTouchUpInside];
[button sizeToFit];
}
}
[_volumeView sizeToFit];
}
-(void)switchAirplayButton {
for (UIButton *button in _volumeView.subviews) {
if ([button isKindOfClass:[UIButton class]]) {
NSLog(@"%d", _controlBar.player.airPlayVideoActive);
if(_controlBar.player.airPlayVideoActive) {
[button setImage:[UIImage imageNamed:@"airplay_icon_pressed.png"] forState:UIControlStateNormal];
} else [button setImage:[UIImage imageNamed:@"airplay_icon.png"] forState:UIControlStateNormal];
[button sizeToFit];
}
}
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if ([object isKindOfClass:[UIButton class]] && [[change valueForKey:NSKeyValueChangeNewKey] intValue] == 1) {
[(UIButton *)object setImage:[UIImage imageNamed:@"airplay_icon.png"] forState:UIControlStateNormal];
[(UIButton *)object sizeToFit];
}
}
播放器是基于AVPLayer的singelton。但是，当检查airPlay是否活动时，它总是返回false。也许它只是beacuse im使用声音，而不是视频。
The "player" is a singelton based on AVPLayer. However, it always returns false when checking if airPlay is active. Maybe it's just beacuse im using sound, not video.
所以我的问题是，我怎么改变按钮...让我们说一个橙色的（只是为了匹配接口的其余部分）airplay是流就像苹果是蓝色的）。我试过一切，它只是不工作。请帮帮我。
So my question is, how could I change the button to... lets say an orange one (just to match the rest of the interface) when airplay is streaming (just like apple is making it blue). I have tried everything and it's just not working at all. Please help me.
推荐答案
编辑：
虽然下面的代码适用于iOS 5和6，从iOS 6.0开始，有一个官方的方式做到这一点，这是容易得多。只需查看 MPVolumeView 的文档，特别是 - setRouteButtonImage：forState：。
Though the code below works on both iOS 5 and 6, starting with iOS 6.0 there is an official way to do this, which is much much easier. Just look at the documentation of MPVolumeView, specifically – setRouteButtonImage:forState:.
====老回答：====
==== Old answer: ====
这很难完成，但我发现了一个iOS 5.0+的方法。首先，将以下行添加到您的ViewController：
This is pretty hard to accomplish, but I found a way for iOS 5.0+. First of all, add the following line to your ViewController:
#import <AudioToolbox/AudioToolbox.h>
在你的viewDidLoad中，你已经做了大部分的事情，这是我的代码： / p>
In your viewDidLoad, you're already doing most of the things right, this is my code:
for (id current in self.volumeView.subviews){
if([current isKindOfClass:[UIButton class]]) {
UIButton *airPlayButton = (UIButton*)current;
self.airPlayButton = airPlayButton;
[self setAirPlayButtonSelected:[self isAirPlayActive]];
[airPlayButton addObserver:self forKeyPath:@"alpha" options:NSKeyValueObservingOptionNew context:nil];
}
}
这里是帮助 setAirPlayButtonSelected 方法，它只是设置图像：
Here's the helper setAirPlayButtonSelected method, it just sets the image:
- (void)setAirPlayButtonSelected:(BOOL)selected {
UIImage* image;
if (selected) {
image = [UIImage imageNamed:@"button-airplay-selected"];
}else {
image = [UIImage imageNamed:@"button-airplay"];
}
[self.airPlayButton setImage:image forState:UIControlStateNormal];
[self.airPlayButton setImage:image forState:UIControlStateHighlighted];
[self.airPlayButton setImage:image forState:UIControlStateSelected];
}
为了完成， observeValueForKeyPath ：
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if (object == self.airPlayButton && [[change valueForKey:NSKeyValueChangeNewKey] intValue] == 1) {
[self setAirPlayButtonSelected:[self isAirPlayActive]];
}
}
现在有趣的部分。这是 isAirPlayActive 帮助方法。它使用AudioSession框架来确定当前正在播放的audioSource。
And now comes the interesting part. Here's the isAirPlayActive helper method. It uses the AudioSession framework to determine the currently playing audioSource.
- (BOOL)isAirPlayActive{
CFDictionaryRef currentRouteDescriptionDictionary = nil;
UInt32 dataSize = sizeof(currentRouteDescriptionDictionary);
AudioSessionGetProperty(kAudioSessionProperty_AudioRouteDescription, &dataSize, ¤tRouteDescriptionDictionary);
if (currentRouteDescriptionDictionary) {
CFArrayRef outputs = CFDictionaryGetValue(currentRouteDescriptionDictionary, kAudioSession_AudioRouteKey_Outputs);
if(CFArrayGetCount(outputs) > 0) {
CFDictionaryRef currentOutput = CFArrayGetValueAtIndex(outputs, 0);
CFStringRef outputType = CFDictionaryGetValue(currentOutput, kAudioSession_AudioRouteKey_Type);
return (CFStringCompare(outputType, kAudioSessionOutputRoute_AirPlay, 0) == kCFCompareEqualTo);
}
}
return NO;
}
因此，所有这些代码都会在应用启动时正确更改AirPlay按钮。如何更新？我们需要监听AudioSource的变化。将以下行添加到您的 viewDidLoad ：
So all this code changes the AirPlay Button correctly on app launch. What about updates? We need to listen for AudioSource changes. Add the following line to your viewDidLoad:
AudioSessionAddPropertyListener (kAudioSessionProperty_AudioRouteChange, audioRouteChangeCallback, (__bridge void*)self);
不要忘记取消注册 dealloc ：
- (void)dealloc {
[self.airPlayButton removeObserver:self forKeyPath:@"alpha"];
AudioSessionRemovePropertyListenerWithUserData(kAudioSessionProperty_AudioRouteChange, audioRouteChangeCallback, (__bridge void*)self);
}
将此C函数添加到ViewController的 @implementation ：
And add this C function above your ViewController's @implementation:
void audioRouteChangeCallback (void *inUserData,
AudioSessionPropertyID inPropertyID,
UInt32 inPropertyValueSize,
const void *inPropertyValue) {
if (inPropertyID != kAudioSessionProperty_AudioRouteChange) {
return;
}
CFDictionaryRef routeChangeDictionary = inPropertyValue;
CFDictionaryRef currentRouteDescriptionDictionary = CFDictionaryGetValue(routeChangeDictionary, kAudioSession_AudioRouteChangeKey_CurrentRouteDescription);
CFArrayRef outputs = CFDictionaryGetValue(currentRouteDescriptionDictionary, kAudioSession_AudioRouteKey_Outputs);
if(CFArrayGetCount(outputs) > 0) {
CFDictionaryRef currentOutput = CFArrayGetValueAtIndex(outputs, 0);
CFStringRef outputType = CFDictionaryGetValue(currentOutput, kAudioSession_AudioRouteKey_Type);
[(__bridge SettingsViewController*)inUserData setAirPlayButtonSelected:CFStringCompare(outputType, kAudioSessionOutputRoute_AirPlay, 0) == kCFCompareEqualTo];
}
}
确定AirPlay输出源是否活动，并相应地调用 setAirPlayButtonSelected 方法。
As you can see, all it does is determine whether or not an AirPlay output source is active and calls the setAirPlayButtonSelected method accordingly.
a href =http://developer.apple.com/library/ios/#documentation/Audio/Conceptual/AudioSessionProgrammingGuide/Introduction/Introduction.html>音频会话编程指南，特别是本部分有关回调如何正确工作的详细信息等。
See Apple's Audio Session Programming Guide, specifically this section for detailed information on how the callbacks exactly work, etc.
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