iOS调节音量卡顿问题

解决调节音量卡顿问题

//
//  VolumeController.m
//  Test
//
//  Created by 王景伟 on 2018/12/21.
//  Copyright © 2018 王景伟. All rights reserved.
//

#import "VolumeController.h"
#import <MediaPlayer/MediaPlayer.h>
#import <AVFoundation/AVFoundation.h>
#import "WJMPVolumeView.h"
#import "WJSlider.h"

// 枚举值，包含水平移动方向和垂直移动方向
typedef NS_ENUM(NSInteger, PanDirection){
    PanDirectionHorizontalMoved, // 横向移动
    PanDirectionVerticalMoved    // 纵向移动
};

@interface VolumeController ()
@property (nonatomic, strong) UISlider *mpVolumeSlider;
@property (nonatomic, strong) dispatch_source_t timer;
@property (nonatomic, assign) CGPoint startPoint;
@property (nonatomic, assign) CGPoint endPoint;
/** 手势滑动方向 */
@property (nonatomic, assign) PanDirection panDirection;
@property (nonatomic, strong) UISlider *meSlider;

@end

@implementation VolumeController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor grayColor];
    
    MPVolumeView *volumeView = [[MPVolumeView alloc] initWithFrame:CGRectZero];
    volumeView.hidden = YES;
    for (UIView *view in [volumeView subviews]) {
        if ([view.class.description isEqualToString:@"MPVolumeSlider"]) {
            _mpVolumeSlider = (UISlider *)view; break;
        }
    }
    [_mpVolumeSlider addTarget:self action:@selector(mpVolumeSliderValueChanged:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:volumeView];
    
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
    [self.view addGestureRecognizer:pan];
    
    ///> 三个判断结束条件缺一不可
    self.meSlider = [[WJSlider alloc]initWithFrame:CGRectMake(100, 300, 200, 50)];
    _meSlider.value = _mpVolumeSlider.value;
    [_meSlider addTarget:self action:@selector(touchDown:) forControlEvents:UIControlEventTouchDown];
    [_meSlider addTarget:self action:@selector(touchUpOutside:) forControlEvents:UIControlEventTouchUpOutside];
    [_meSlider addTarget:self action:@selector(touchUpInside:) forControlEvents:UIControlEventTouchUpInside];
    [_meSlider addTarget:self action:@selector(touchCancel:) forControlEvents:UIControlEventTouchCancel];
    [self.view addSubview:self.meSlider];
}


- (void)panGesture:(UIPanGestureRecognizer *)pan {
    //获取当前页面手指触摸的点
    CGPoint locationPoint = [pan locationInView:pan.view];
    //速率 用来判断方向
    CGPoint veloctyPoint = [pan velocityInView:pan.view];
    
    switch (pan.state) {
        case UIGestureRecognizerStateBegan:{
            // 使用绝对值来判断移动的方向
            CGFloat x = fabs(veloctyPoint.x);
            CGFloat y = fabs(veloctyPoint.y);
            
            if (x > y) {
                self.panDirection = PanDirectionHorizontalMoved;
            } else if (x < y){
                self.panDirection = PanDirectionVerticalMoved;

            }
            self.startPoint = locationPoint;
        } break;
        case UIGestureRecognizerStateChanged:{
            self.endPoint = locationPoint;
            switch (self.panDirection) {
                case PanDirectionHorizontalMoved:{
                    
                } break;
                    
                case PanDirectionVerticalMoved:{
                    [self startGCDTimerCompletion:^{
                        [self setVolumeSliderWithPoint:self.endPoint];
                    }];
                }  break;
                default: break;
            }
            
        } break;
        case UIGestureRecognizerStateEnded:{
            [self endGCDtimer];
        }  break;
        default: break;
    }
}

- (void)startGCDTimerCompletion:(void (^)(void))completion {
    if (_timer) return;
    NSTimeInterval period = 0.05; //设置时间间隔 0.1秒也可以
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
    dispatch_source_set_timer(_timer, dispatch_walltime(NULL, 0), period * NSEC_PER_SEC, 0);
    // 事件回调
    dispatch_source_set_event_handler(_timer, ^{
        dispatch_async(dispatch_get_main_queue(), ^{
            if (completion) completion();
        });
    });
    // 开启定时器
    dispatch_resume(_timer);
}

- (void)endGCDtimer {
    if (!_timer) return;
    dispatch_source_cancel(_timer);
    _timer = nil;
}


- (void)setVolumeSliderWithPoint:(CGPoint)point {
    ///> 目前的value
    CGFloat nowVolumeValue = _mpVolumeSlider.value;
    CGFloat changeValue = (point.y - _startPoint.y)/ 200.0;
    
    [self.mpVolumeSlider setValue:nowVolumeValue += changeValue animated:YES];
    
    NSLog(@"changeValue %f",changeValue);
    
    _meSlider.value = (nowVolumeValue += changeValue);
    _startPoint = point;
}



- (void)touchDown:(UISlider *)slider {
    NSLog(@"%s",__func__);
    [self startGCDTimerCompletion:^{
        [self.mpVolumeSlider setValue:slider.value animated:YES];
        [self.mpVolumeSlider sendActionsForControlEvents:UIControlEventAllEvents];
    }];
}
- (void)touchCancel:(UISlider *)slider {
    NSLog(@"%s",__func__);
    [self endGCDtimer];
}
- (void)touchUpOutside:(UISlider *)slider {
    NSLog(@"%s",__func__);
    [self endGCDtimer];
}
- (void)touchUpInside:(UISlider *)slider {
    NSLog(@"%s",__func__);
    [self endGCDtimer];
}


- (void)mpVolumeSliderValueChanged:(UISlider *)slider {
    if (_timer) return;
    _meSlider.value = _mpVolumeSlider.value;
}

@end