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GHGestureDemo

Chinese | English

The pinch gesture and the drag gesture coexist to achieve the adjustment of the focal length

note

Execute before runningpod install

please choose GHGestureDemo run git is large and unclear, please download demo to run to see

If you run crash, add key Privacy - Camera Usage Description to iofo.plist

WechatIMG88.jpeg

Features

+ Package permission checker
+ Package camera module implements one line of code call
+ Camera permission judgment, app activation from background to foreground camera permission judgment
+ Drag and pinch gestures to dynamically adjust camera lens focal length

Review drag gestures UIPanGestureRecognizer

First look at api to provide integration properties and methods

minimumNumberOfTouches setting requires a minimum of a few finger drags maximumNumberOfTouches settings support up to a few finger drags (CGPoint)translationInView:(nullable UIView *)view; Get the current position (void)setTranslation:(CGPoint)translation inView:(nullable UIView *)view;Set current position (void)setTranslation:(CGPoint)translation inView:(nullable UIView *)view; Set the drag speed

Review the pinch gesture UIPinchGestureRecognizer

scale scaling

velocity drag speed

Both gestures can add listener events when initializing

UIPinchGestureRecognizer *pinchGest = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchView:)];
UIPanGestureRecognizer *panGest = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panView:)];

Implementing the listening method separately

- (void)pinchView:(UIPinchGestureRecognizer *)pinchGest{
}
- (void)panView:(UIPanGestureRecognizer *)panGest{
}

If there are multiple gestures at the same time, you need to override the proxy method

- (BOOL)gestRecognizer:(UIGestureRecognizer *)gestRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    
    Return YES;
}

Dependency

GHPrivacyAuthTool permission checker

GHCameraModule.h camera integration module

UIView+GHAdd.h Classification of UIView

Custom view

Customize a view named GHAdjustFocal, There are five parts inside which are backGround background circle circle slider slider add plus ``sub` minus

The position of the circle can be set via the property circleCenterY There are also two to get the current centerY of the circle and the total height of the slider

Key Method

videoScaleAndCropFactor Adjust the focus property, the minimum is 1, so add 1 for each value in order to be safe.

  AVCaptureConnection * videoConnection = [self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo];

    [self.previewLayer setAffineTransform:CGAffineTransformMakeScale(1+value, 1+value)];
    videoConnection.videoScaleAndCropFactor = 1 + value;
    

I define a method to pass the value obtained after the gesture operation.

- (void)adjustFocalWtihValue: (CGFloat)value

Called in the controller

Initialization

Declare a property zoomScale, because the default is the largest, so initialize to 1

self.zoomScale = 1;

The focal length of the camera is also the largest 10

[self.cameraModule adjustFocalWtihValue:10];

Add pinch gestures and drag gestures on the view

Calculation

Drag gesture

/// Sliding distance
CGPoint trans = [panGest translationInView:panGest.view];
/// Get the center y value of the circle
    CGFloat circleCenterY = [self.adjustFocal getCircleCenterY]; /// circleY
 /// y value increments
    circleCenterY += trans.y;
     /// Get the total distance to slide
    CGFloat totalHeight = [self.adjustFocal getSliderHeight]; /// total sliding length
  /// handle the top crossover
    If (circleCenterY <= 20) {
        circleCenterY = 20; /// handle the top
    }
     /// handle the bottom of the boundary

    If (circleCenterY >= self.adjustFocal.gh_height - 40 + 20) {
        circleCenterY = self.adjustFocal.gh_height - 40 + 20;
    }
    
    /// Refresh the y value of the circle
    self.adjustFocal.circleCenterY = circleCenterY;
    /// Calculate the scale
    CGFloat scale = (totalHeight - circleCenterY + 20)/totalHeight;
    self.zoomScale = scale;
    Self.test.transform = CGAffineTransformMakeScale(scale, scale);
    Self.value.text = [NSString stringWithFormat:@"proportion%.2f",scale];
    /// Reset
    [panGest setTranslation:CGPointZero inView:panGest.view];
    /// Dynamically change the camera focal length
    [self.cameraModule adjustFocalWtihValue:scale * 10];

Tip

Finally, don't forget to remove the monitor.

[[NSNotificationCenter defaultCenter] removeObserver:self];

Other related knowledge points

Gesture Recognizer Gesture Recognition

Launched on iOS 3.2

Initialization method

/// Initialize
- (instancetype)initWithTarget:(nullable id)target action:(nullable SEL)action

/// Add a listener
- (void)addTarget:(id)target action:(SEL)action;

/// Remove the listener
- (void)removeTarget:(nullable id)target action:(nullable SEL)action;

state

Typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {
    UIGestureRecognizerStatePossible, // The default state, the gesture at this time has no specific situation
    UIGestureRecognizerStateBegan, // the state at which the gesture begins to be recognized
    UIGestureRecognizerStateChanged, // Gesture recognition changed state
    UIGestureRecognizerStateEnded, // gesture recognition ends, the method that will trigger
    UIGestureRecognizerStateCancelled, // Gesture recognition canceled
    UIGestureRecognizerStateFailed, // recognition failed, method will not be called
    UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded
};

Attributes

delegate gesture agent

enabled Set whether the gesture is valid    view Get the view where the gesture is located

cancelsTouchesInView defaults to YES. When touch is recognized, all touch events sent by touchesCancelled:withEvent: orPRESSesCancelled:withEvent: are terminated.

delaysTouchesBegan defaults to NO. When the touch starts, it will send a message to the event delivery chain. If set to YES, it will not send a message to the event delivery chain until the touch is not recognized.

delaysTouchesEnded defaults to YES. After setting the gesture recognition, this property immediately sends a touchesEnded orPRESSesEnded message to the event delivery chain or waits for a short time. If no new gesture recognition task is received, send it again.

allowedTouchTypes       allowedPressTypes

####method

[A requireGestureRecognizerToFail:B] gesture mutual exclusion It can specify that when the A gesture occurs, even if A has met the condition, it will not be triggered immediately, and will wait until the specified gesture B determines that the failure has occurred.
- (void)requireGestureRecognizerToFail:(UIGestureRecognizer *)otherGestureRecognizer;

/ / Get the current touch point
- (CGPoint)locationInView:(nullable UIView*)view;

/ / Set the number of touch points
- (NSUInteger)numberOfTouches;

/ / Get the touch location of a touch point
- (CGPoint)locationOfTouch:(NSUInteger)touchIndex inView:(nullable UIView*)view;

If you are helpful to you, please help me a star, thanks very much.