iOS 改變UISwitch大小的例子詳解

UISwitch如果放置在一個UIView裡，那麼它就會根據父控制項UIView固定好大小，不管你怎麼設定UISwitch的frame都改變不了它的大小，解決的辦法如下：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.view.backgroundColor = [UIColor grayColor];
    UIView *mainView = [[UIView alloc] initWithFrame:CGRectMake(0, 50, kScreenWidth, 30)];
    mainView.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:mainView];
    
    UISwitch *nameSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(kScreenWidth / 2.0, 0, 25, 15)];
    nameSwitch.on = YES;
    nameSwitch.transform = CGAffineTransformMakeScale(0.7, 0.6); //改變大小的關鍵代碼
    [mainView addSubview:nameSwitch];
}

補充:

1.UISwitch的初始化

UISwitch *switchView = [[UISwitch alloc] initWithFrame:CGRectMake(54.0f, 16.0f, 100.0f, 28.0f)];
2.設定UISwitch的初始化狀態

switchView.on = YES;//設定初始為ON的一邊
 3.UISwitch事件的響應

[switchView addTarget:self action:@selector(switchAction:) forControlEvents:UIControlEventValueChanged];