ios学习笔记（三）UISlider与UISwitch控件

1 首先我们还是创建一个Single View Application，然后打开MainStoryboard_iphone.storyboard,在IB中添加一个UISlider控件和一个Label，这个Label用来显示Slider的值。

选中新加的Slider控件，打开Attribute Inspector，修改属性值，设置最小值为0，最大值为100，当前值为0.5，并确保勾选上Continuous，如下图：

接着我们放上UISwitch控件，就是很像开关的那种控件，它只有两个状态：on和off，全都放上去效果就是这样的：

2.好了我们开始写代码喽：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 
#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
接着是实现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]; 
} 
 
- (voi