objective-c - 如何检测 UISwitch 是否打开/关闭？

Question

我正在尝试检测 UISwitch 何时打开/关闭

// .h
IBOutlet UISwitch *privateSwitch;
@property (nonatomic, retain) IBOutlet UISwitch *privateSwitch;

//.m
@synthesize privateSwitch;
privateSwitch = [[UISwitch alloc] init];
howToDisplay = @"no";

// In my cellForRowsAtIndexPath
UISwitch *privateSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(199, 8, 0, 0)];
[privateSwitch addTarget:self action:@selector(switchToggled:) forControlEvents: UIControlEventTouchUpInside];
[cell.contentView addSubview:privateSwitch];

if ([howToDisplay isEqualToString:@"no"]) {
    [privateSwitch setOn:NO animated:NO];
} else {
    [privateSwitch setOn:YES animated:NO];
}

- (void) switchToggled:(id)sender {

if ([privateSwitch isOn]) {
NSLog(@"its on!");
howToDisplay = @"yes";
[formDataTwo removeAllObjects];
[formTableView reloadData];
[privateSwitch setOn:YES animated:YES];
} else {
NSLog(@"its off!");
howToDisplay = @"no";
[formDataTwo removeAllObjects];
[formDataTwo addObject:@"Facebook"];
[formDataTwo addObject:@"Twitter"];
[formDataTwo addObject:@"Flickr"];
[formDataTwo addObject:@"Tumblr"];
[formDataTwo addObject:@"Email"];
[formDataTwo addObject:@"MMS"];

[formTableView reloadData];
[privateSwitch setOn:NO animated:YES];
}

}

但是，当我打开它时，它会说它已关闭。是什么赋予了？

谢谢。

Answer 1

在您的方法中，您声明了一个隐藏您的实例变量cellForRowsAtIndexPath的局部变量。UISwitch *privateSwitchprivateSwitch

在您的switchToggled:操作中，您使用实例变量来测试开关的状态，而不是在cellForRowAtIndexPath. 您可以sender像这样使用参数：

- (void) switchToggled:(id)sender {
    UISwitch *mySwitch = (UISwitch *)sender;
    if ([mySwitch isOn]) {
        NSLog(@"its on!");
    } else {
        NSLog(@"its off!");
    }
}

PS：我会使用UIControlEventValueChanged而不是UIControlEventTouchUpInside.