iOS 改变UISwitch大小的例子详解

UISwitch如果放置在一个UIView里，那么它就会根据父控件UIView固定好大小，不管你怎么设置UISwitch的frame都改变不了它的大小，解决的办法如下：

- (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); //改变大小的关键代码
    [mainView addSubview:nameSwitch];
}

补充:

1.UISwitch的初始化

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

switchView.on = YES;//设置初始为ON的一边
 3.UISwitch事件的响应

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