IOS學習筆記(七)之UISegmentedControl分段控件的基本概念和使用方法(博客地址：http://blog.csdn.net/developer_jiangqq)

Author:hmjiangqq

Email:jiangqqlmj@163.com

UISegmentedControl

首先看下官網介紹:

A UISegmentedControl object is a horizontal control made of multiple segments, each segment functioning as a discrete button. A segmented control affords a compact means to group together a number of controls.

A segmented control can display a title (an NSString object) or an image (UIImage object). The UISegmentedControl object automatically resizes segments to fit proportionally within their superview unless they have a specific width set. When you add and remove segments, you can request that the action be animated with sliding and fading effects.

分段控件是一種選擇控件，功能有點類似於Windows中的單選按鈕，由兩端或者更多段組成，

每個段相當於一個獨立的按鈕。這控件一般有兩種樣式-Plain&Bordered樣式和Bar樣式，

Bordered樣式是在Plain樣式上面加上了一個邊框.Plain和Bordered樣式中每一段都可以設置文本

和添加圖片.Bar樣式整體來說比較窄，在其中我們一般不會放置圖片。

常用的屬性和方法如下:

實例代碼如下:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    
    NSArray *array=@[@"搜索",@"選擇",@"視頻",@"圖片"];
    UISegmentedControl *segmentControl=[[UISegmentedControl alloc]initWithItems:array];
    segmentControl.segmentedControlStyle=UISegmentedControlStyleBordered;
    //設置位置 大小
    segmentControl.frame=CGRectMake(60, 100, 200, 40);
    //默認選擇
    segmentControl.selectedSegmentIndex=1;
    //設置背景色
    segmentControl.tintColor=[UIColor greenColor];
    //設置監聽事件
    [segmentControl addTarget:self action:@selector(change:) forControlEvents:UIControlEventValueChanged];
    [self.window addSubview:segmentControl];
    [segmentControl release];
    
    [self.window makeKeyAndVisible];
    return YES;
}

-(void)change:(UISegmentedControl *)segmentControl{
    NSLog(@"segmentControl %d",segmentControl.selectedSegmentIndex);
}

運行截圖: