最近有一个需求,就是控制系统的音量,我们都知道原理在mediaPlayer.framework框架下,有方法
// The current volume of playing music, in the range of 0.0 to 1.0.
// This property is deprecated -- use MPVolumeView for volume control instead.
@property(nonatomic) float volume NS_DEPRECATED_IOS(3_0, 7_0);
[[MPMusicPlayerController applicationMusicPlayer] setVolume:self.volumeSlider.value];
但实际上,在ios7以后,就被弃用了,官方的说法是希望我们用MPVolumeView来代替.那么好,现在有一个问题是,MPVolumeView很难自定义,他只能自定义一些图片,如果我们想通过手势来上下来控制音量大小怎么做呢?
MPVolumeView *volumeView = [[MPVolumeView alloc] init];
[self.view addSubview:volumeView];
[volumeView sizeToFit];
NSLog(@"%@",volumeView.subviews);
打印他的subViews,你会发现
有一个叫MPVolumeSlider得类,那么我们只要能控制这个类就行了,可是如果我们强制创建这个类是无法实现的,但是没关系,他的baseClass是UISlider我们可以通过这种方法实现
self.slider = [[UISlider alloc]init];
self.slider.backgroundColor = [UIColor blueColor];
for (UIControl *view in volumeView.subviews) {
if ([view.superclass isSubclassOfClass:[UISlider class]]) {
NSLog(@"1");
self.slider = (UISlider *)view;
}
}
self.slider.autoresizesSubviews = NO;
self.slider.autoresizingMask = UIViewAutoresizingNone;
[self.view addSubview:self.slider];
这个时候还会发现一个问题就是,他的frame是(0,0,35,34),那么你会发现你等于的slider永远都在屏幕的左上角,这个问题我的处理方式是直接hidden = yes,然后重新在建立一个slider与他的值进行关联,然后重写touch事件,这样就可以直接通过手势来控制了.下面是完整代码
#import "ViewController.h"
@interface ViewController ()
@property (nonatomic,strong)UISlider *volumeSlider;
@property (nonatomic,strong)UISlider *slider;
@property (nonatomic,assign)CGPoint firstPoint;
@property (nonatomic,assign)CGPoint secondPoint;
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
MPVolumeView *volumeView = [[MPVolumeView alloc] init];
[self.view addSubview:volumeView];
[volumeView sizeToFit];
NSLog(@"%@",volumeView.subviews);
self.slider = [[UISlider alloc]init];
self.slider.backgroundColor = [UIColor blueColor];
for (UIControl *view in volumeView.subviews) {
if ([view.superclass isSubclassOfClass:[UISlider class]]) {
NSLog(@"1");
self.slider = (UISlider *)view;
}
}
self.slider.autoresizesSubviews = NO;
self.slider.autoresizingMask = UIViewAutoresizingNone;
[self.view addSubview:self.slider];
self.slider.hidden = YES;
NSLog(@"%f",self.slider.value);
// UISlider *slider =
// self.volumeSlider = [[UISlider alloc]initWithFrame:CGRectMake(100, 100, 200, 100)];
// self.volumeSlider.backgroundColor = [UIColor yellowColor];
// self.volumeSlider.minimumValue = 0.0;
// self.volumeSlider.maximumValue = 1.0;
// self.volumeSlider.continuous = YES;
// [self.volumeSlider addTarget:self action:@selector(volumeChange) forControlEvents:UIControlEventValueChanged];
// [self.view addSubview:self.volumeSlider];
UISlider *slider1 = [[UISlider alloc] initWithFrame:CGRectMake(0, 100, 200, 20)];
slider1.tag = 1000;
slider1.minimumValue = self.slider.minimumValue;
slider1.maximumValue = self.slider.maximumValue;
slider1.value = self.slider.value;
[slider1 addTarget:self action:@selector(updateva lue:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:slider1];
}
- (void)updateva lue:(UISlider *)slider{
self.slider.value = slider.value;
}
- (void)volumeCha