1 首先我們還是創建一個Single View Application，然后打開MainStoryboard_iphone.storyboard,在IB中添加一個UISlider控件和一個Label，這個Label用來顯示Slider的值。
選中新加的Slider控件，打開Attribute Inspector，修改屬性值，設置最小值為0，最大值為100，當前值為0.5，并確保勾選上Continuous，如下圖：
接著我們放上UISwitch控件，就是很像開關的那種控件，它只有兩個狀態：on和off，全都放上去效果就是這樣的：
2.好了我們開始寫代碼嘍：ViewController.h：
~~~
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController{
UILabel *sliderlabel;
UISwitch *leftSwitch;
UISwitch *rightSwitch;
}
@property (nonatomic,retain) IBOutlet UILabel *sliderlabel;
@property (nonatomic,retain) IBOutlet UISwitch *leftSwitch;
@property (nonatomic,retain) IBOutlet UISwitch *rightSwitch;
- (IBAction)sliderChanged:(id)sender;
- (IBAction)switchChanged:(id)sender;
@end
~~~
接著是實現 ViewController.m:
~~~
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize sliderlabel;
@synthesize leftSwitch;
@synthesize rightSwitch;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
return YES;
}
}
- (IBAction)sliderChanged:(id)sender{
UISlider *slider=(UISlider*)sender;
int progressAsInt=(int)(slider.value+0.5f);
NSString *newText=[[NSString alloc] initWithFormat:@"%d",progressAsInt];
sliderlabel.text=newText;
[newText release];
NSLog(@"%d",progressAsInt);
}
- (IBAction)switchChanged:(id)sender{
UISwitch *whichSwich=(UISwitch *)sender;
BOOL setting=whichSwich.isOn;
[leftSwitch setOn:setting animated:YES];
[rightSwitch setOn:setting animated:YES];
}
- (void)dealloc{
[sliderlabel release];
[leftSwitch release];
[rightSwitch release];
[super dealloc];
}
@end
~~~
3.剩下的就是連接操作和輸出口：
將slider控件的value changed事件與sliderChanged方法連接在一起，將swich控件的value changed事件與swichChanged方法連接在一起，當然還要把lable控件和swich控件的輸出與ViewController的相應控件接口連接在一起。
最終實現的效果如下面兩張圖：?????????????????????????????????????????????????????????
????????????
