override init(frame: CGRect) {super.init(frame: frame)setThumbImage(UIImage.init(named: "music_controller"), for: .normal)}// 改变滑块的触摸范围override func thumbRect(forBounds bounds: CGRect, trackRect rect:

封装GCD定时器#import "WSTimer.h"@implementation WSTimerstatic NSMutableDictionary *timers;dispatch_semaphore_t semaphore;+ (void)initialize {static dispatch_once_t onceToken;dispatch_once(&onceToken, ^