Xcode中UISlider相關函數

//左右軌的圖片
UIImage *stetchLeftTrack = [UIImage imageNamed:@"snow_bar.png"];
UIImage *stetchRightTrack = [UIImage imageNamed:@"sun_bar.png"];
//滑塊圖片
UIImage *thumbImage = [UIImage imageNamed:@"mark.png"];

UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(30,320,257,7)];
slider.backgroundColor = [UIColor clearColor];
slider.value = 1.0;
slider.minimumValue = 0.7;
slider.maximumValue = 1.0;

//設置背景圖片
[slider setMinimumTrackImage:stetchLeftTrack forState:UIControlStateNormal];
[slider setMaximumTrackImage:stetchRightTrack forState:UIControlStateNormal];

//注意這裏務必加上UIControlStateHightlighted的狀態，否則當拖動滑塊時滑塊將變成原生的控件
[slider setThumbImage:thumbImage forState:UIControlStateHighlighted];
[slider setThumbImage:thumbImage forState:UIControlStateNormal];

//滑塊拖動時的事件
[slider addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged];

//滑塊拖動後的事件
[slider addTarget:self action:@selector(sliderDragUp:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:slider];

其中綁定事件函數的返回值必須爲IBAction，

- (IBAction) SliderValue:(id)sender