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Check programmatically created UIView visible or not


Check programmatically created UIView visible or not

By : jjune0110
Date : November 19 2020, 03:59 PM
I think the issue was by ths following , you can check if view is exist or not using isDescendantOfView but make sure you have to pass your vwInfo's superview to check view already exist or not.
code :
if ([vwInfo isDescendantOfView:self.view]) {
    //view already exist in self.view
}
else{
   //view is not exist in self.view.
}


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How to add constraints programmatically to a programmatically created UIView?

How to add constraints programmatically to a programmatically created UIView?


By : Nilesh Srivastava
Date : March 29 2020, 07:55 AM
hope this fix your issue For anyone who comes across this... I needed to add more than one constraint. That did the trick.
How to add UIViewController as target of UIButton action created in programmatically created UIView?

How to add UIViewController as target of UIButton action created in programmatically created UIView?


By : William
Date : March 29 2020, 07:55 AM
may help you . If you are adding the button programmatically to a subclass of UIView, then you can do it one of two ways:
code :
[viewSubclass.buttonName addTarget:self action:@selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];
@protocol ButtonProtocolName

- (void)buttonWasPressed;

@end
@property (nonatomic, assign) id <ButtonProtocolName> delegate;
[button addTarget:self action:@selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];
- (void)buttonTapped:(id)sender {
    [self.delegate buttonWasPressed];
}
@interface someViewController : UIViewController <SomeButtonProtocolName>
SomeView *view = ... // Init your view
// Set the delegate
view.delegate = self;
- (void)buttonWasPressed {
    // Put code here for button's intended action.
}
// Simple delegate protocol.
protocol SomeViewDelegate: class {
  // Method used to tell the delegate that the button was pressed in the subview.
  // You can add parameters here as you like.
  func buttonWasPressed()
}

class SomeView: UIView {
  // Define the view's delegate.
  weak var delegate: SomeViewDelegate?

  // Assuming you already have a button.
  var button: UIButton!

  // Once your view & button has been initialized, configure the button's target.
  func configureButton() {
    // Set your target
    self.button.addTarget(self, action: #selector(someButtonPressed(_:)), for: .touchUpInside)
  }

  @objc func someButtonPressed(_ sender: UIButton) {
    delegate?.buttonWasPressed()
  }
}

// Conform to the delegate protocol
class SomeViewController: UIViewController, SomeViewDelegate {
  var someView: SomeView!

  func buttonWasPressed() {
    // UIViewController can handle SomeView's button press.
  }
}
// Use typeAlias to define closure
typealias ButtonPressedHandler = () -> Void

class SomeView: UIView {
  // Define the view's delegate.
  var pressedHandler: ButtonPressedHandler?

  // Assuming you already have a button.
  var button: UIButton!

  // Once your view & button has been initialized, configure the button's target.
  func configureButton() {
    // Set your target
    self.button.addTarget(self, action: #selector(someButtonPressed(_:)), for: .touchUpInside)
  }

  @objc func someButtonPressed(_ sender: UIButton) {
    pressedHandler?()
  }
}

class SomeViewController: UIViewController {
  var someView: SomeView!

  // Set the closure in the ViewController
  func configureButtonHandling() {
    someView.pressedHandler = {
      // UIViewController can handle SomeView's button press.
    }
  }
}
Center X of a programmatically created UIView to another UIView - Objective C

Center X of a programmatically created UIView to another UIView - Objective C


By : Eric
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Just to try it out I create a Button programmatically as below , You may need to do this to both your button and your label:
code :
    [button setTranslatesAutoresizingMaskIntoConstraints:FALSE];
    [_testlabel setTranslatesAutoresizingMaskIntoConstraints:FALSE];
[self.view addConstraints: ... constraintsWithVisualFormat ...];
[self.view addConstraint: ... constraintWithItem ...]
UILabel is not visible on dynamically created UIView

UILabel is not visible on dynamically created UIView


By : Joey qiushi
Date : March 29 2020, 07:55 AM
will help you I'm attempting to create a custom view programmatically to show an error message for an error condition. The following is what the ViewController looks like: , I think your UILabel needs a frame.
Add Button to UIView Created Programmatically

Add Button to UIView Created Programmatically


By : Pony Ma
Date : March 29 2020, 07:55 AM
With these it helps I created UIView and Button programmatically , The issue is caused by this line of code:
code :
button.frame = newView.frame // Equivalent to button.frame = CGRectMake(4, 39, width, height)
button.frame = CGRectMake(0, 0, width, height)
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