Checkbox control for iOS application - ios

Question

Is there any checkbox control in the object library for iOS applications? The nearest thing I see is the switch control, which can take a boolean value.

Answer 1

You can use the selected state of a UIButton, set different images (or also texts) for differents (via code, or Interface Builder) :
[button setImage:[UIImage imageNamed:#"selected.png"]
forState:UIControlStateSelected];
[button setImage:[UIImage imageNamed:#"unselected.png"]
forState:UIControlStateNormal];
And in the touch up inside action :
- (IBAction)buttonTouched:(id)sender
{
button.selected = !button.selected;
// add other logic
}

Answer 2

//define property of button
Declare Unchecked Image
- (void)viewDidLoad
{
[_checkboxButton setBackgroundImage:[UIImage imageNamed:#"unchecked.png"] forState:UIControlStateNormal];
}
Checked Image.
- (IBAction)buttonTapped:(id)sender
{
if (_checkboxButton.selected == YES)
{
[_checkboxButton setBackgroundImage:[UIImage imageNamed:#"unchecked.png"] forState:UIControlStateSelected];
_checkboxButton.selected = NO;
}
else
{
[_checkboxButton setBackgroundImage:[UIImage imageNamed:#"checked.png"] forState:UIControlStateNormal];
_checkboxButton.selected = YES;
}
}

Answer 3

This is the code I use for two checkboxes on the screen. (I put them at the bottom of two pictures that are also on the screen. I use the UIControlEventTouchDown to call the checkBoxTapped method. This method talks to my main view controller where I decide if the answer was correct or incorrect. Then the main view controller calls back the this view and tells it to change the blank textbox to either a check:
or an x
// Put the Checkboxes on the screen
UIImage *checkBox = [UIImage imageNamed:#"Checkbox"];
self.checkBoxLeft = [UIButton buttonWithType:UIButtonTypeCustom];
[self.checkBoxLeft setImage:checkBox forState:UIControlStateNormal];
[self.checkBoxLeft setFrame:checkBoxFrameLeft];
[self.checkBoxLeft addTarget:self
action:#selector(checkBoxTapped:)
forControlEvents:UIControlEventTouchDown];
[self.checkBoxLeft setTitle:#"checkBoxLeft" forState:UIControlStateNormal];
self.checkBoxLeft.contentEdgeInsets = insets;
self.checkBoxLeft.showsTouchWhenHighlighted = NO; // Keeps it from turning gray
self.checkBoxRight = [UIButton buttonWithType:UIButtonTypeCustom];
[self.checkBoxRight setImage:checkBox forState:UIControlStateNormal];
[self.checkBoxRight setFrame:checkBoxFrameRight];
[self.checkBoxRight addTarget:self
action:#selector(checkBoxTapped:)
forControlEvents:UIControlEventTouchDown];
[self.checkBoxRight setTitle:#"checkBoxRight" forState:UIControlStateNormal];
self.checkBoxRight.contentEdgeInsets = insets;
self.checkBoxRight.showsTouchWhenHighlighted = NO; // Keeps it from turning gray
- (void)checkBoxTapped:(UIButton *)buttonPressed {
[[self delegate] checkBoxTapped:buttonPressed.currentTitle];
}
- (void)highlightCheckbox:(NSString *)checkboxToHighlight withHighlight:(NSString *)highlight {
if ( [checkboxToHighlight isEqualToString:#"left"] ){
[self.checkBoxLeft setImage:[UIImage imageNamed:highlight] forState:UIControlStateNormal];
} else {
[self.checkBoxRight setImage:[UIImage imageNamed:highlight] forState:UIControlStateNormal];
}
}