如果IBAction中的其他语句-iOS

Question

I have constructed if-else statement to make UIButtons act as a toggle before, but this set of code seems to be a little more challenging. I have 2 separate IBActions right now, one called open, the other called close. I would like to make it one IBAction that works as a toggle via an if-else statement. Here is the code for both IBActions.

- (IBAction)actionOpen:(id)sender {
    [self.flatDatePicker show];
}

- (IBAction)actionClose:(id)sender {
    [self.flatDatePicker dismiss];
}

Answer 1

Set a property or something, like this...

// in the private extension

@property (nonatomic) BOOL flatDatePickerOpen;

Then do something like this...

- (IBAction)toggleFlatDatePicker {
    if (self.flatDatPickerOpen) {
        [self.flatDatePicker dismiss];
        self.flatDatePickerOpen = NO;
    } else {
        [self.flatDatePicker show];
        self.flatDatePickerOpen = YES;
    }
}

You don't have to specify the sender part of the action either. If you're not using it then there's no need for it.

Alternatively, use a property on the flatDatePicker that tells you whether it is visible or not instead of the additional property.

Answer 2

You don't have to create your own property for this, the flat picker already has one defined as:

@property(nonatomic,readonly) BOOL        isOpen;                 // read only property, indicate in datepicker is open.

So...

- (IBAction)toggleFlatDatePicker {
    if (self.flatDatePicker.isOpen) {
        [self.flatDatePicker dismiss];
    }else{
        [self.flatDatePicker show];
    } 
}

Answer 3

Create a BOOL type in your header for datePickerShowing

@property (nonatomic,assign) BOOL datePickerShowing;

Synthesize it in your .m file

@synthesize datePickerShowing;

Set this to NO in your init method. datePickerShowing = NO;

In your IBAction:

if (datePickerShowing) {
    [flatDatePicker dismiss];
    datePickerShowing = NO;
} else {
    [flatDatePicker show];
    datePickerShowing = YES;
}

Answer 4

I would imagine self.flatDatePicker is a UIDatePicker object, which inherits from UIView . There is no need for a separate state flag, simply examine the UIView.hidden property:

- (IBAction)actionToggle:(id)sender {
    if (self.flatDatePicker.hidden)
        [self.flatDatePicker show];
    else
        [self.flatDatePicker dismiss];
}