iOS iPhone sleep / Action 前的间隔

Question

在 UIRotationGestureRecognizer 中，我将执行 drawCircleView 操作。但是这个 Action 应该在一秒钟内最多开始 10 次。

UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateContainerView:)];

rotation.delegate = self;

[_containerView addGestureRecognizer:rotation];


- (void)rotateContainerView:(UIRotationGestureRecognizer*)sender
{
    static CGFloat initialScale;
    if (sender.state == UIGestureRecognizerStateBegan) {
        initialScale = (_Ro + 0.1)*-1;
        _Rotation=0;
    }
    _Ro = (sender.rotation*-1);


    sleep(.1);
    [self drawCircleView];
}

我已经测试了以下内容

sleep(0.1);
[NSThread sleepForTimeInterval:.1];
NSThread sleepUntilDate: [NSDate dateWithTimeIntervalSinceNow:0.1]];
[NSThread sleepForTimeInterval:.1];

但尽管如此，所有操作似乎都排在队列中。

我如何在没有查询队列的情况下执行此操作？

完整代码

//
    //  CLHoleEffect.m
    //
    //  Created by Kevin Siml - Appzer.de on 2013/10/23.
    //  Copyright (c) 2013 Appzer.de. All rights reserved.
    //

    #import "CLSwirlEffect.h"
    #import "UIView+Frame.h"

    @interface CLSwirlCircle : UIView
    @property (nonatomic, strong) UIColor *color;
    @end

    @interface CLSwirlEffect()
    <UIGestureRecognizerDelegate>
    @end

    @implementation CLSwirlEffect
    {
        UIView *_containerView;
        UIView *_container;
        CLSwirlCircle *_circleView;
        UILabel* circleLabel;

        CGFloat _X;
        CGFloat _Y;
        CGFloat _R;
        CGFloat _Ro;
        CGFloat _Rotation;

    }

    #pragma mark-

    + (NSString*)defaultTitle
    {
        return NSLocalizedStringWithDefaultValue(@"CLSwirlEffect_DefaultTitle", nil, [CLImageEditorTheme bundle], @"Swirl", @"");
    }

    + (BOOL)isAvailable
    {
        return ([UIDevice iosVersion] >= 5.0);
    }

    - (id)initWithSuperView:(UIView*)superview imageViewFrame:(CGRect)frame toolInfo:(CLImageToolInfo *)info
    {
        self = [super initWithSuperView:superview imageViewFrame:frame toolInfo:info];
        if(self){
            _containerView = [[UIView alloc] initWithFrame:frame];
            [superview addSubview:_containerView];
            _X = 0.5;
            _Y = 0.5;
            _R = 0.5;
            _Ro = 0.5;
            [self setUserInterface];
        }
        return self;
    }

    - (void)cleanup
    {
        [_containerView removeFromSuperview];
    }

    - (UIImage*)applyEffect:(UIImage*)image
    {
        CGFloat R = (_R + 0.1);
        GPUImageSwirlFilter *stillImageFilter = [[GPUImageSwirlFilter alloc] init];
        [stillImageFilter setAngle: _Ro];
        [stillImageFilter setRadius:R];
        [stillImageFilter setCenter:CGPointMake(_X,_Y)];
        UIImage *quickFilteredImage = [stillImageFilter imageByFilteringImage:image];
        return quickFilteredImage;
    }

    #pragma mark-

    - (void)setUserInterface
    {
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapContainerView:)];
        UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panContainerView:)];
        UIPinchGestureRecognizer *pinch    = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchContainerView:)];
        UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateContainerView:)];

        pan.maximumNumberOfTouches = 1;

        tap.delegate = self;
        pan.delegate = self;
        pinch.delegate = self;
        rotation.delegate = self;

        [_containerView addGestureRecognizer:tap];
        [_containerView addGestureRecognizer:pan];
        [_containerView addGestureRecognizer:pinch];
        [_containerView addGestureRecognizer:rotation];

        _circleView = [[CLSwirlCircle alloc] init];
        _circleView.backgroundColor = [UIColor clearColor];
        _circleView.color = [UIColor whiteColor];
        [_containerView addSubview:_circleView];

        [self drawCircleView];
    }

    #define DEGREES_TO_RADIANS(x) (M_PI * x / 180.0)


    - (void)drawCircleView
    {
        CGFloat R = MIN(_containerView.width, _containerView.height) * (_R + 0.1) * 1.2;
        _circleView.width  = R;
        _circleView.height = R;
        _circleView.center = CGPointMake(_containerView.width * _X, _containerView.height * _Y);
        [_circleView setNeedsDisplay];

        [self.delegate effectParameterDidChange:self];

    }

    - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
        // if the gesture recognizers are on different views, don't allow simultaneous recognition
        if (gestureRecognizer.view != otherGestureRecognizer.view)
            return NO;

        // if either of the gesture recognizers is the long press, don't allow simultaneous recognition
        if ([gestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]] || [otherGestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]])
            return NO;

        return YES;
    }

    - (void)tapContainerView:(UITapGestureRecognizer*)sender
    {
        CGPoint point = [sender locationInView:_containerView];

        _X = MIN(1.0, MAX(0.0, point.x / _containerView.width));
        _Y = MIN(1.0, MAX(0.0, point.y / _containerView.height));

        [self drawCircleView];

        if (sender.state == UIGestureRecognizerStateEnded){
            [self.delegate effectParameterDidChange:self];
        }
    }
    - (void)panContainerView:(UIPanGestureRecognizer*)sender
    {

        CGPoint point = [sender locationInView:_containerView];
        _X = MIN(1.0, MAX(0.0, point.x / _containerView.width));
        _Y = MIN(1.0, MAX(0.0, point.y / _containerView.height));

        [self drawCircleView];

        if (sender.state == UIGestureRecognizerStateEnded){
            //[self.delegate effectParameterDidChange:self];
        }
    }

    - (void)pinchContainerView:(UIPinchGestureRecognizer*)sender
    {

        static CGFloat initialScale;
        if (sender.state == UIGestureRecognizerStateBegan) {
            initialScale = (_R + 0.1);
        }
        _R = MIN(1.1, MAX(0.1, initialScale * sender.scale)) - 0.1;

        [self drawCircleView];
        if (sender.state == UIGestureRecognizerStateEnded){
            // [self.delegate effectParameterDidChange:self];
        }
    }

    - (void)rotateContainerView:(UIRotationGestureRecognizer*)sender
    {
        static CGFloat initialScale;
        if (sender.state == UIGestureRecognizerStateBegan) {
            initialScale = (_Ro + 0.1)*-1;
            _Rotation=0;
        }
        _Ro = (sender.rotation*-1);


        [self drawCircleView];
        if (sender.state == UIGestureRecognizerStateEnded){
            // [self.delegate effectParameterDidChange:self];
        }
    }

    @end

    #pragma mark- UI components

    @implementation CLSwirlCircle

    - (void)setFrame:(CGRect)frame
    {
        [super setFrame:frame];
        [self setNeedsDisplay];
    }

    - (void)setCenter:(CGPoint)center
    {
        [super setCenter:center];
        [self setNeedsDisplay];
    }

    - (void)drawRect:(CGRect)rect

    {
        CGContextRef context = UIGraphicsGetCurrentContext();
        CGRect rct = self.bounds;
        rct.origin.x += 1;
        rct.origin.y += 1;
        rct.size.width -= 2;
        rct.size.height -= 2;

        CGContextSetStrokeColorWithColor(context, self.color.CGColor);
        CGContextStrokeEllipseInRect(context, rct);

        self.alpha = 1;

        [UIView animateWithDuration:kCLEffectToolAnimationDuration
                              delay:1
                            options:UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction
                         animations:^{
                             self.alpha = 0;
                         }
                         completion:^(BOOL finished) {
                         }
         ];
    }
    @end

Answer 1

要限制方法 rotateContainerView: 在一秒钟内被调用不超过 10 次，您可以为第一次调用添加时间戳并比较每个后续调用的时间戳，允许方法仅在调用时完成时间戳大于上次调用时间戳加上 0.1 秒。

添加NSDate类型的属性-

@property (nonatomic, strong) NSDate *lastCall;

然后将rotateContainerView:修改成这样——

- (void)rotateContainerView:(UIRotationGestureRecognizer*)sender
{
    static CGFloat initialScale;
    NSDate *nowCall = [NSDate date];// timestamp

    if (sender.state == UIGestureRecognizerStateBegan) {
        lastCall = nowCall;
        initialScale = (_Ro + 0.1)*-1;
        _Rotation=0;
        _Ro = (sender.rotation*-1);
        [self drawCircleView];
    }
    else {
        if ([nowCall timeIntervalSinceDate:lastCall] > 0.1) {
              _Ro = (sender.rotation*-1);
              [self drawCircleView];
              lastCall = nowCall;
         }
    }
}