Solution to the Problem of UIButton Click Not Responding in iOS

Preface

In daily development, we often deal with buttons, but sometimes we encounter difficult-to-handle problems, such as buttons not responding to click events. At this time, we need to investigate from the following aspects

Reasons why the button does not respond

1The button is added to a parent View that does not enable user interaction, such as UIImageView. In this case, enable the interaction of the parent view view.userInteractionEnabled = YES

Setting it to YES can solve the problem

2The button itself is obscured, and when clicked, it is not clicked on the button but on the upper layer View, which naturally will not respond

There is a method to view the layer, as shown in the figure below, clicking the button in the red box can see the UI elements of the current running interface, and you can see if any view is blocking the button

3The frame of the button exceeds the frame of the parent view, which is the most likely to occur. The button's frame must be clicked within the frame of the parent view to be effective. As shown in the figure below, the button click area in the red box does not respond.

What should you do if you encounter this problem? Please continue to read below

Solve the problem of clicking outside the click area

This situation is very likely to occur, let me give you an example: the height of the chat area is less than the height of the keyboard, and the input box is a child View of the chat area. After the keyboard pops up, the input box moves up and exceeds the frame of the parent view. At this time, clicking the button in the red box to switch to the expression keyboard action does not respond.

Solution

There are two methods here, and these two methods will be called every time there is a touch action

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event;
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event;

Override the method - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event

This is a method in View, and the processing flow is as follows

• Firstly, call the pointInside:withEvent: method of the current view to determine whether the touch point is inside the current view;
• If it returns NO, hitTest:withEvent: returns nil;
• If it returns YES, send the hitTest:withEvent: message to all subviews of the current view, and the traversal order of all subviews is from top to bottom, that is, from the end of the subviews array, until a non-empty object is returned from a subview or all subviews have been traversed;
• If the first child view returns a non-empty object, the hitTest:withEvent: method returns this object, and the processing ends;
• If all child views return non, then the hitTest:withEvent: method returns itself (self).
• Finally, this touch event is handed over to the view object returned by the hitTest:withEvent: method of the main window to handle.

Therefore, we can handle it when returning nil, because at this time the button is outside the parent View

//Returns a view to respond to the event
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
 UIView *view = [super hitTest:point withEvent:event];
 if (view == nil){
  //Coordinate Transformation
  CGPoint tempPoint = [self.testBtn convertPoint:point fromView:self];
  //Determine whether the click point is within the button area
  if (CGRectContainsPoint(self.testBtn.bounds, tempPoint)){
   //Return Button
   return _testBtn;
  }
 }
 return view;
}

At this time, clicking outside the area of the button also has an effect

Summary

The above-mentioned solutions to the problem of iOS UIButton not responding to clicks are introduced by the editor for everyone. I hope it will be helpful to everyone. If you have any questions, please leave a message, and the editor will reply to everyone in time. I would also like to express my sincere gratitude to everyone for their support of the Yell Tutorial!

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