如何在iPhone中自定义UISwitch按钮？

Question

我用这段代码创建了一个UISwitch ......

UISwitch *switch = [[UISwitch alloc]initWithFrame:CGRectMake(110, 230, 60, 60)];
[window addSubview:switchView];
[switchView release];

创建的按钮将是....

默认属性是,

1. 它包含" ON "和" OFF "状态
2. OFF按钮是白色&ON按钮是蓝色的颜色

我想创建一个自定义开关,以便更改开关中的背景颜色和文本.可能吗？请详细解释.

提前致谢,

Rajkanth

Answer 1

除非并且直到您编写自己的控件,否则无法修改UISwitch控件,

但到目前为止最好的方法是,您可以使用UISegmentControl并处理它上面的事件来切换on.png和off.png图像.

UISegmentedControl* switchView=[[UISegmentedControl alloc] initWithItems:[[[NSMutableArray alloc] initWithObjects:@"On",@"Off",nil] autorelease]];
    [switchView setFrame:CGRectMake(20,365,140,28)];
    switchView.selectedSegmentIndex=0;
    switchView.segmentedControlStyle=UISegmentedControlStyleBar;
    [switchView setImage:[UIImage imageNamed:@"onSelected.png"] forSegmentAtIndex:0];
    [switchView setImage:[UIImage imageNamed:@"off.png"] forSegmentAtIndex:1];
    [switchView addTarget:self action:@selector(checkOnOffState:) forControlEvents:UIControlEventValueChanged];

    self.navigationItem.titleView=switchView;

并写这样的checkOnOffState方法代码 -

-(IBAction)checkOnOffState:(id)sender{

    UISegmentedControl* tempSeg=(UISegmentedControl *)sender;
    if(tempSeg.selectedSegmentIndex==0){
        [tempSeg setImage:[UIImage imageNamed:@"onSelected.png"] forSegmentAtIndex:0];
        [tempSeg setImage:[UIImage imageNamed:@"off.png"] forSegmentAtIndex:1];
    }
    else{
        [tempSeg setImage:[UIImage imageNamed:@"on.png"] forSegmentAtIndex:0];
        [tempSeg setImage:[UIImage imageNamed:@"offSelected.png"] forSegmentAtIndex:1];
    }   
}