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IOS中*常用到的控件UIButton、UISlider、UISwitch、UISegmentedControl通过Xib文件拖动生成非常简单，其实用代码实现也是一样的简单，当然，用代码实现能够掌握到更多的东西。
上图中包涵提到的4种控件，UIButton按钮、UISlider滑块、UISwitch开关、UISegmentedControl分类

首先创建一个名为CodeControls的Empty Application项目

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AppDelegate.h和AppDelegate.m文件中和IOS代码实现Hello World中的一样

MainViewController.h

#import <UIKit/UIKit.h>

@interface MainViewController : UIViewController

@property (strong, nonatomic) UIButton *myBtn;
@property (strong, nonatomic) UISlider *mySlider;
@property (strong, nonatomic) UISwitch *mySwitch;
@property (strong, nonatomic) UISegmentedControl *mySc;

@end

MainViewController.m

#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];
}

// 点击Button触发
– (void)onClick:(id *)sender
{

}

// 拉动Slider划块触发
– (void)onChange:(id *)sender
{

}

// 选择Switch触发
– (void)onSwitch:(id *)sender
{

}

// 选择UISegmentedControl触发
– (void)onSelect:(id *)sender
{
}
这里没有写点击每个控件的具体实现方法。

UICnotrol Class 下的所有Touch事件

UIControlEventTouchDown
UIControlEventTouchDownRepeat
UIControlEventTouchDragInside
UIControlEventTouchDragOutside
UIControlEventTouchDragEnter
UIControlEventTouchDragExit
UIControlEventTouchUpInside
UIControlEventTouchUpOutside
UIControlEventTouchCancel
UIControlEventValueChanged
UIControlEventEditingDidBegin
UIControlEventEditingChanged
UIControlEventEditingDidEnd
UIControlEventEditingDidEndOnExit
UIControlEventAllTouchEvents
UIControlEventAllEditingEvents
UIControlEventApplicationReserved
UIControlEventSystemReserved
UIControlEventAllEvents

UIButton Class下的所有按钮样式

UIButtonTypeCustom
UIButtonTypeRoundedRect
UIButtonTypeDetailDisclosure
UIButtonTypeInfoLight
UIButtonTypeInfoDark
UIButtonTypeContactAdd