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iOS Application Development with OpenCV 3 by Joseph Howse

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Expanding the view controller's implementation

Let's reopen ViewController.m to complete the implementation. First, let's add the custom getter and setter for the blendMode property. The getter will simply return the _blendMode variable, as seen in the following code:

@implementation ViewController

- (BlendMode)blendMode {
  return _blendMode;
}

The setter will check whether the new value differs from the old value. If so, the new value will be assigned to _blendMode, and the blendSettingsChanged property will be set to YES, as seen in the following code:

- (void)setBlendMode:(BlendMode)blendMode {
  if (blendMode != _blendMode) {
    _blendMode = blendMode;
    self.blendSettingsChanged = YES;
  }
}

Now, let's look at the new implementation of the processImageHelper: ...

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