@interface MainViewController : UIViewController    @property (strong, nonatomic) UIButton *myBtn;  @property (strong, nonatomic) UISlider *mySlider;  @property (strong, nonatomic) UISwitch *mySwitch;  @property (strong, nonatomic) UISegmentedControl *mySc;    @end</span>  MainViewController.m  [cpp] view plaincopy<span style="font-size:10px;">#import "MainViewController.h"    @interface MainViewController ()    @end    @implementation MainViewController  @synthesize myBtn,mySlider,mySwitch,mySc;    - (void)viewDidLoad  {      // 加载UIView      UIView *mainView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];      mainView.backgroundColor = [UIColor whiteColor];      self.view = mainView;      [mainView release];            // 创建一个Button按钮      UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];      btn.frame = CGRectMake(100, 30, 57, 57);      [btn setTitle:@"Button" forState:UIControlStateNormal];      [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];      [btn setBackgroundImage:[UIImage imageNamed:@"icon.png"] forState:UIControlStateNormal];      [btn addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];      myBtn = btn;      [self.view addSubview:myBtn];                  // 创建一个Slider划块按钮      UISlider *slider = [[[UISlider alloc] initWithFrame:CGRectMake(50, 180, 200, 10)] autorelease];      slider.minimumValue = 0.0f;      slider.maximumValue = 100.0f;      slider.value = 50.0f;      [slider addTarget:self action:@selector(onChange:) forControlEvents:UIControlEventTouchUpInside];      mySlider = slider;      [self.view addSubview:mySlider];            // 创建一个UISwitch开关按钮      UISwitch *sbtn = [[[UISwitch alloc] initWithFrame:CGRectMake(50, 210, 200, 50)] autorelease];      [sbtn addTarget:self action:@selector(onSwitch:) forControlEvents:UIControlEventTouchUpInside];      mySwitch = sbtn;      [self.view addSubview:mySwitch];            // 创建一个UISegmentedControl      NSArray *btnList = [NSArray arrayWithObjects:@"left",@"center",@"right", nil];      UISegmentedControl *sc = [[[UISegmentedControl alloc] initWithItems:btnList] autorelease];      sc.frame = CGRectMake(50, 250, 200, 60);      [sc addTarget:self action:@selector(onSelect:) forControlEvents:UIControlEventTouchUpInside];      mySc = sc;      [self.view addSubview:mySc];            [super viewDidLoad];  }    @interface MainViewController : UIViewController    @property (strong, nonatomic) UIButton *myBtn;  @property (strong, nonatomic) UISlider *mySlider;  @property (strong, nonatomic) UISwitch *mySwitch;  @property (strong, nonatomic) UISegmentedControl *mySc;    @end</span>  MainViewController.m  [cpp] view plaincopy<span style="font-size:10px;">#import "MainViewController.h"    @interface MainViewController ()    @end    @implementation MainViewController  @synthesize myBtn,mySlider,mySwitch,mySc;    - (void)viewDidLoad  {      // 加载UIView      UIView *mainView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];      mainView.backgroundColor = [UIColor whiteColor];      self.view = mainView;      [mainView release];            // 创建一个Button按钮      UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];      btn.frame = CGRectMake(100, 30, 57, 57);      [btn setTitle:@"Button" forState:UIControlStateNormal];      [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];      [btn setBackgroundImage:[UIImage imageNamed:@"icon.png"] forState:UIControlStateNormal];      [btn addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];      myBtn = btn;      [self.view addSubview:myBtn];                  // 创建一个Slider划块按钮      UISlider *slider = [[[UISlider alloc] initWithFrame:CGRectMake(50, 180, 200, 10)] autorelease];      slider.minimumValue = 0.0f;      slider.maximumValue = 100.0f;      slider.value = 50.0f;      [slider addTarget:self action:@selector(onChange:) forControlEvents:UIControlEventTouchUpInside];      mySlider = slider;      [self.view addSubview:mySlider];            // 创建一个UISwitch开关按钮      UISwitch *sbtn = [[[UISwitch alloc] initWithFrame:CGRectMake(50, 210, 200, 50)] autorelease];      [sbtn addTarget:self action:@selector(onSwitch:) forControlEvents:UIControlEventTouchUpInside];      mySwitch = sbtn;      [self.view addSubview:mySwitch];            // 创建一个UISegmentedControl      NSArray *btnList = [NSArray arrayWithObjects:@"left",@"center",@"right", nil];      UISegmentedControl *sc = [[[UISegmentedControl alloc] initWithItems:btnList] autorelease];      sc.frame = CGRectMake(50, 250, 200, 60);      [sc addTarget:self action:@selector(onSelect:) forControlEvents:UIControlEventTouchUpInside];      mySc = sc;      [self.view addSubview:mySc];            [super viewDidLoad];  }    @interface MainViewController : UIViewController    @property (strong, nonatomic) UIButton *myBtn;  @property (strong, nonatomic) UISlider *mySlider;  @property (strong, nonatomic) UISwitch *mySwitch;  @property (strong, nonatomic) UISegmentedControl *mySc;    @end</span>  MainViewController.m  [cpp] view plaincopy<span style="font-size:10px;">#import "MainViewController.h"    @interface MainViewController ()    @end    @implementation MainViewController  @synthesize myBtn,mySlider,mySwitch,mySc;    - (void)viewDidLoad  {      // 加载UIView      UIView *mainView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];      mainView.backgroundColor = [UIColor whiteColor];      self.view = mainView;      [mainView release];            // 创建一个Button按钮      UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];      btn.frame = CGRectMake(100, 30, 57, 57);      [btn setTitle:@"Button" forState:UIControlStateNormal];      [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];      [btn setBackgroundImage:[UIImage imageNamed:@"icon.png"] forState:UIControlStateNormal];      [btn addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];      myBtn = btn;      [self.view addSubview:myBtn];                  // 创建一个Slider划块按钮      UISlider *slider = [[[UISlider alloc] initWithFrame:CGRectMake(50, 180, 200, 10)] autorelease];      slider.minimumValue = 0.0f;      slider.maximumValue = 100.0f;      slider.value = 50.0f;      [slider addTarget:self action:@selector(onChange:) forControlEvents:UIControlEventTouchUpInside];      mySlider = slider;      [self.view addSubview:mySlider];            // 创建一个UISwitch开关按钮      UISwitch *sbtn = [[[UISwitch alloc] initWithFrame:CGRectMake(50, 210, 200, 50)] autorelease];      [sbtn addTarget:self action:@selector(onSwitch:) forControlEvents:UIControlEventTouchUpInside];      mySwitch = sbtn;      [self.view addSubview:mySwitch];            // 创建一个UISegmentedControl      NSArray *btnList = [NSArray arrayWithObjects:@"left",@"center",@"right", nil];      UISegmentedControl *sc = [[[UISegmentedControl alloc] initWithItems:btnList] autorelease];      sc.frame = CGRectMake(50, 250, 200, 60);      [sc addTarget:self action:@selector(onSelect:) forControlEvents:UIControlEventTouchUpInside];      mySc = sc;      [self.view addSubview:mySc];            [super viewDidLoad];  }