ios 怎么在代码中修改 uisegmentedcontrol的segments的个数

ios 怎么在代码中修改 uisegmentedcontrol的segments的个数

当用户输入不仅仅是布尔值时，可使用分段控件（UISegmentedControl）。分段控件提供一栏按钮（有时称为按钮栏），但只能激活其中一个按钮。分段控件会导致用户在屏幕上看到的内容发生变化。它们常用于在不同类别的信息之间选择，或在不同的应用屏幕之间切换。下面介绍基本属性和基本方法的使用。

NSArray *segmentedArray = [[NSArrayalloc]initWithObjects:@"1",@"2",@"3",@"4",nil];

//初始化UISegmentedControl

UISegmentedControl *segmentedControl = [[UISegmentedControlalloc]initWithItems:segmentedArray];

segmentedControl.frame = CGRectMake(20.0, 20.0, 250.0, 50.0);

segmentedControl.selectedSegmentIndex = 2;//设置默认选择项索引

segmentedControl.tintColor = [UIColor redColor];

　　//有基本四种样式

segmentedControl.segmentedControlStyle = UISegmentedControlStylePlain;//设置样式

//segmentedControl.segmentedControlStyle = UISegmentedControlStyleBordered;//设置样式

//segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;//设置样式

//segmentedControl.segmentedControlStyle = UISegmentedControlStyleBezeled;//设置样式

// segmentedControl.momentary = YES;//设置在点击后是否恢复原样

[segmentedControl setTitle:@"two" forSegmentAtIndex:1];//设置指定索引的题目

[segmentedControl setImage:[UIImage imageNamed:@"btn_jyy.png"] forSegmentAtIndex:3];//设置指定索引的图片

[segmentedControl insertSegmentWithImage:[UIImage imageNamed:@"mei.png"] atIndex:2 animated:NO];//在指定索引插入一个选项并设置图片

[segmentedControl insertSegmentWithTitle:@"insert" atIndex:3 animated:NO];//在指定索引插入一个选项并设置题目

[segmentedControl removeSegmentAtIndex:0 animated:NO];//移除指定索引的选项

// [segmentedControl setWidth:70.0 forSegmentAtIndex:2];//设置指定索引选项的宽度

// [segmentedControl setContentOffset:CGSizeMake(10.0,10.0) forSegmentAtIndex:4];//设置选项中图片等的左上角的位置

//获取指定索引选项的图片imageForSegmentAtIndex：

UIImageView *imageForSegmentAtIndex = [[UIImageViewalloc]initWithImage:[segmentedControl imageForSegmentAtIndex:1]];

imageForSegmentAtIndex.frame = CGRectMake(60.0, 120.0, 30.0, 30.0); ;

//获取指定索引选项的标题titleForSegmentAtIndex

UILabel *titleForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(100.0, 160.0, 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, 170.0, 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, 210.0, 70.0, 30.0)];

widthForSegmentAtIndex.text = [NSString stringWithFormat:@"%f",[segmentedControl widthForSegmentAtIndex:2]];

// [segmentedControl setEnabled:NO forSegmentAtIndex:4];//设置指定索引选项不可选

// BOOL enableFlag = [segmentedControl isEnabledForSegmentAtIndex:4];//判断指定索引选项是否可选

[mySegmentedControladdTarget:selfaction:@selector(segmentAction:)forControlEvents:UIControlEventValueChanged]; //添加委托方法

//具体委托方法实例

-(void)segmentAction:(UISegmentedControl *)Seg{

NSInteger Index = Seg.selectedSegmentIndex;

NSLog(@"Index %i", Index);

switch (Index) {

case 0:

[self selectmyView1];

break;

case 1:

[self selectmyView2];

break;

case 2:

[self selectmyView3];

break;

case 3:

[self selectmyView4];

break;

case 4:

[self selectmyView5];

break;

case 5:

[self selectmyView6];

break;

default:

break;

}

}

基本属性、方法如上，大家在实际开发中可根据实际需求选取适当属性和方法。

使用技巧：

在导航栏中添加UISegmentedControl ，实现的效果：

实现的代码：

//自定义UISegmentedcontrol

UISegmentedControl *segmentedControl=[[UISegmentedControl alloc] initWithFrame:CGRectMake(80.0f, 8.0f, 200.0f, 30.0f) ];
[segmentedControl insertSegmentWithTitle:@"Food to eat" atIndex:0 animated:YES];
[segmentedControl insertSegmentWithTitle:@"Food to avoid" atIndex:1 animated:YES];
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
segmentedControl.momentary = YES;
segmentedControl.multipleTouchEnabled=NO;
[segmentedControl addTarget:self action:@selector(Selectbutton:) forControlEvents:UIControlEventValueChanged];
UIBarButtonItem *segButton = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl]; //自定义UIBarButtonItem，封装定义好的UIsegmented。
[segmentedControl release];
self.navigationItem.rightBarButtonItem = segButton; //添加到导航栏中
[segButton release];

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