iOS开发基础控件--UISegmentedControl

UISegmentedControl全局外观设置

         

         分段控件是我们常用的控件之一，今天把具体用法总结了下：

          1.初始化UISegmentedControl

NSArray *segmentedArray = [[NSArray alloc]initWithObjects:@"1",@"2",@"3",nil];
UISegmentedControl *segmentedTemp = [[UISegmentedControl alloc]initWithItems:segmentedArray];
self.segmentedControl = segmentedTemp;
segmentedControl.frame = CGRectMake(10.0, 10.0, 300.0, 29.0);

     2.常用属性及设置方法如下：
//设置指定索引的题目
[segmentedControl setTitle:@"1" forSegmentAtIndex:1];
//设置指定索引的图片
[segmentedControl setImage:[UIImage imageNamed:@"home.png"] forSegmentAtIndex:2];
//在指定索引插入一个选项并设置图片
[segmentedControl insertSegmentWithImage:[UIImage imageNamed:@"more.png"] atIndex:2 animated:NO];
//在指定索引插入一个选项并设置题目
[segmentedControl insertSegmentWithTitle:@"new" atIndex:3 animated:NO];
//移除指定索引的选项
[segmentedControl removeSegmentAtIndex:0 animated:NO];
//设置指定索引选项的宽度
[segmentedControl setWidth:60.0 forSegmentAtIndex:2];
//设置选项中图片等的左上角的位置
//[segmentedControl setContentOffset:CGSizeMake(10.0,10.0) forSegmentAtIndex:1];

//设置默认选择项索引
segmentedControl.selectedSegmentIndex = 2;
//分段控件的颜色，只有样式为UISegmentedControlStyleBar的时候才有效果
segmentedControl.tintColor = [UIColor redColor];
//设置样式
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBordered;
//设置在点击后是否恢复原样
segmentedControl.momentary = NO;
//设置指定索引选项不可选
[segmentedControl setEnabled:NO forSegmentAtIndex:3];
//判断指定索引选项是否可选
BOOL enableFlag = [segmentedControl isEnabledForSegmentAtIndex:3];
NSLog(@"%d",enableFlag);

        3.分段控件点击事件：

[segmentedControl addTarget:self
                     action:@selector(segmentAction:)
           forControlEvents:UIControlEventValueChanged];

        响应的事件：

-(void)segmentAction:(UISegmentedControl *)Seg
{
    NSInteger index = Seg.selectedSegmentIndex;
    switch (index) {
        case 0:
            NSLog(@"0 clicked.");
            break;
        case 1:
            NSLog(@"1 clicked.");
            break;
        case 2:
            NSLog(@"2 clicked.");
            break;
        case 3:
            NSLog(@"3 clicked.");
            break;
        case 4:
            NSLog(@"4 clicked.");
            break;
        default:
            break;
    }
}

         4.获取分段控件相应的值：

//获取指定索引选项的图片imageForSegmentAtIndex：
UIImageView *imageForSegmentAtIndex = [[UIImageView alloc]initWithImage:[segmentedControl imageForSegmentAtIndex:1]];
imageForSegmentAtIndex.frame = CGRectMake(60.0, 100.0, 30.0, 30.0);

//获取指定索引选项的标题titleForSegmentAtIndex
UILabel *titleForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(100.0, 100.0, 30.0, 30.0)];
titleForSegmentAtIndex.text = [segmentedControl titleForSegmentAtIndex:0];

//获取总选项数segmentedControl.numberOfSegments
UILabel *numberOfSegments = [[UILabel alloc]initWithFrame:CGRectMake(140.0, 100.0, 30.0, 30.0)];
numberOfSegments.text = [NSString stringWithFormat:@"%d",segmentedControl.numberOfSegments];

//获取指定索引选项的宽度widthForSegmentAtIndex：
UILabel *widthForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(180.0, 100.0, 70.0, 30.0)];
widthForSegmentAtIndex.text = [NSString stringWithFormat:@"%f",[segmentedControl widthForSegmentAtIndex:2]];

         但是这样的分段控件只有固定的几种样式。在IOS5以后，可以全局的设置一些控件的外观，分段控件就是其中一个（全局设置UISegmentedControl外观）：

//cap insets用来指定哪些区域是固定不变的，未制定的区域则会repeat

UIImage *segmentSelected = [[UIImage imageNamed:@"bg_o.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(5, 5, 5, 5)];

UIImage *segmentUnselected = [[UIImage imageNamed:@"bg.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(5, 5, 5, 5)];

UIImage *segmentSelectedUnselected = [UIImage imageNamed:@"line.png"] ;

UIImage *segUnselectedSelected = [UIImage imageNamed:@"line.png"] ;

UIImage *segmentUnselectedUnselected = [UIImage imageNamed:@"line.png"];

//Segmente未选中背景
[[UISegmentedControl appearance] setBackgroundImage:segmentUnselected
                                           forState:UIControlStateNormal
                                         barMetrics:UIBarMetricsDefault];

//Segmente选中背景
[[UISegmentedControl appearance] setBackgroundImage:segmentSelected
                                           forState:UIControlStateSelected
                                         barMetrics:UIBarMetricsDefault];

//Segmente左右都未选中时的分割线
//BarMetrics表示navigation bar的状态，UIBarMetricsDefault 表示portrait状态（44pixel height），UIBarMetricsLandscapePhone 表示landscape状态（32pixel height）

[[UISegmentedControl appearance] setDividerImage:segmentUnselectedUnselected
                             forLeftSegmentState:UIControlStateNormal
                               rightSegmentState:UIControlStateNormal
                                      barMetrics:UIBarMetricsDefault];

[[UISegmentedControl appearance] setDividerImage:segmentSelectedUnselected
                             forLeftSegmentState:UIControlStateSelected
                               rightSegmentState:UIControlStateNormal
                                      barMetrics:UIBarMetricsDefault];

[[UISegmentedControl appearance] setDividerImage:segUnselectedSelected
                             forLeftSegmentState:UIControlStateNormal
                               rightSegmentState:UIControlStateSelected
                                      barMetrics:UIBarMetricsDefault];

//字体
NSDictionary *textAttibutesUnSelected = [NSDictionary dictionaryWithObjectsAndKeys:
                               [UIFont systemFontOfSize:18],UITextAttributeFont,
                               [UIColor blackColor],UITextAttributeTextColor,
                               [UIColor whiteColor],UITextAttributeTextShadowColor,
                               [NSValue valueWithCGSize:CGSizeMake(1, 1)],UITextAttributeTextShadowOffset,nil];

NSDictionary *textAttibutesSelected = [NSDictionary dictionaryWithObjectsAndKeys:
                                         [UIFont systemFontOfSize:18],UITextAttributeFont,
                                         [UIColor whiteColor],UITextAttributeTextColor,
                                         [UIColor whiteColor],UITextAttributeTextShadowColor,
                                         [NSValue valueWithCGSize:CGSizeMake(0, 0)],UITextAttributeTextShadowOffset,nil];

[[UISegmentedControl appearance] setTitleTextAttributes:textAttibutesUnSelected
                                               forState:UIControlStateNormal];

[[UISegmentedControl appearance] setTitleTextAttributes:textAttibutesSelected
                                               forState:UIControlStateSelected];