UISlider样式修改

_slider = [[UISlider alloc]initWithFrame:CGRectMake(30 * MyWidth / 320, 415 * MyHeight / 568, 260 * MyWidth / 320, 30 * MyHeight / 568)];

    _slider.backgroundColor = [UIColor clearColor];

    _slider.value = 0.0;

    [_slider setMinimumTrackImage:[UIImage imageNamed:@"iconfont-xiai.png"] forState:UIControlStateNormal];

    [_slider setMaximumTrackImage:[UIImage imageNamed:@"iconfont-xiai.png"] forState:UIControlStateNormal];

    //注意这里要加UIControlStateHightlighted的状态，否则当拖动滑块时滑块将变成原生的控件

    [_slider setThumbImage:[UIImage imageNamed:@"iconfont-xiai.png"] forState:UIControlStateHighlighted];

    [_slider setThumbImage:[UIImage imageNamed:@"iconfont-xiai.png"] forState:UIControlStateNormal];

    [_slider addTarget:self action:@selector(changeTimerValue:) forControlEvents:UIControlEventValueChanged];

    [self.view addSubview:_slider];