控制系統音量,自己定義MPVolumeView

近期有乙個需求,就是控制系統的音量,我們都知道原理在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);

但實際上,在ios7以後,就被棄用了,官方的說法是希望我們用mpvolumeview來取代.那麼好,如今有乙個問題是,mpvolumeview非常難自己定義,他僅僅能自己定義一些,假設我們想通過手勢來上下來控制音量大小怎麼做呢?

mpvolumeview *volumeview = [[mpvolumeview alloc] init];
[self.view addsubview:volumeview];
[volumeview sizetofit];
nslog(@"%@",volumeview.subviews);

列印他的subviews,你會發現

有乙個叫mpvolumeslider得類,那麼我們僅僅要能控制這個類即可了,但是假設我們強制建立這個類是無法實現的,但是沒關係,他的baseclass是uislider我們能夠通過這樣的方法實現

self.slider = [[uislider alloc]init];
self.slider.backgroundcolor = [uicolor bluecolor];
for (uicontrol *view in volumeview.subviews) 
}self.slider.autoresizessubviews = no;
self.slider.autoresizingmask = uiviewautoresizingnone;
[self.view addsubview:self.slider];

這個時候還會發現乙個問題就是,他的frame是(0,0,35,34),那麼你會發現你等於的slider永遠都在螢幕的左上角,這個問題我的處理方式是直接hidden = yes,然後又一次在建立乙個slider與他的值進行關聯,然後重寫touch事件,這樣就能夠直接通過手勢來控制了.以下是完整**

#import "viewcontroller.h"
@inte***ce 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
}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(updatevalue:) forcontrolevents:uicontroleventvaluechanged];
[self.view addsubview:slider1];
}- (void)updatevalue:(uislider *)slider
- (void)volumechange
- (void)touchesbegan:(nsset *)touches withevent:(uievent *)event
uislider *slider = (uislider *)[self.view viewwithtag:1000];
slider.value = self.slider.value;
nslog(@"touchesbegan");
}- (void)touchesmoved:(nsset *)touches withevent:(uievent *)event
nslog(@"firstpoint==%f || secondpoint===%f",self.firstpoint.y,self.secondpoint.y);
nslog(@"first-second==%f",self.firstpoint.y - self.secondpoint.y);
self.slider.value += (self.firstpoint.y - self.secondpoint.y)/500.0;
uislider *slider = (uislider *)[self.view viewwithtag:1000];
slider.value = self.slider.value;
nslog(@"value == %f",self.slider.value);
self.firstpoint = self.secondpoint;
}- (void)touchesended:(nsset *)touches withevent:(uievent *)event

控制系統音量,自己定義MPVolumeView

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windows api 控制系統音量

iOS控制系統音量的大小

控制系統音量,自己定義MPVolumeView

C 控制系統音量

windows api 控制系統音量

iOS控制系統音量的大小

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