事件上的动画图像

Question

我有一个圆圈内的圆圈大约 10 个圆圈的图像，每个不同的颜色我想在按钮从中心到外部单击时一个一个地显示它们，在另一个按钮上单击从外到内一个一个地消失。这可能吗？如何？ 请推荐

Answer 1

你可以从下面的代码中得到帮助，我没有错，你正在寻找雷达风格的动画

#import "RadarAnimation.h"

@implementation RadarAnimation

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {

        [self SetUPAnimation];

        // Initialization code
    }
    return self;
}


-(void)SetUPAnimation
{


    [self AddRader];
    double delayInSeconds = 1.5;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        [self AddRader];
    });


}

-(void)AddRader
{
    UIView *view = [[UIView alloc] init];
    //    view.backgroundColor = [UIColor blueColor];
    view.frame=self.frame;
    [self setWidth:[Helper currentWidth] ofView:view];
    [self setHeight:[Helper currentWidth] ofView:view];
    [self setXPossitionto:self.frame.size.width/2-view.frame.size.width/2 ofView:view];
    [self setYPossitionto:self.frame.size.height/2-view.frame.size.height/2 ofView:view];


    view.layer.cornerRadius = CGRectGetHeight(view.frame)/2;
    view.tag=175751;
    int kRingExpansionTime=6.0;

    CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    scaleAnimation.duration = kRingExpansionTime;
    scaleAnimation.repeatCount = HUGE_VAL;
    scaleAnimation.autoreverses = YES;
    scaleAnimation.fromValue = [NSNumber numberWithFloat:0.0];
    scaleAnimation.toValue = [NSNumber numberWithFloat:1.8];

    [view.layer addAnimation:scaleAnimation forKey:@"scale"];


    // fade out the ring part way thru the animation
    CABasicAnimation* alphaAnim = [CABasicAnimation animationWithKeyPath:@"opacity"];
    alphaAnim.fromValue   = [NSNumber numberWithFloat:0.3];
    alphaAnim.toValue     = [NSNumber numberWithFloat:0.1];
    alphaAnim.beginTime   = kRingExpansionTime * 0.7f;      // start part way thru
    alphaAnim.duration    = kRingExpansionTime - alphaAnim.beginTime;

    CAAnimationGroup* group = [CAAnimationGroup animation];
    group.duration    = kRingExpansionTime;
    group.repeatCount = HUGE_VALF;      // repeat forever
    group.animations  = [NSArray arrayWithObjects:scaleAnimation,alphaAnim, nil];

    [view.layer addAnimation:group forKey:nil];

    view.backgroundColor = [UIColor colorWithRed:0/255.0 green:135.0/255.0 blue:219.0/255.0 alpha:0.5];
    view.alpha=0.4;
    view.layer.borderColor = [UIColor colorWithRed:0/255.0 green:135.0/255.0 blue:255.0/255.0 alpha:1.0].CGColor;
    view.layer.borderWidth = 2.0;
    //view.center=_VwEmptyplaceholder.center;
    //view.center=CGPointMake(_VwEmptyplaceholder.frame.size.width/2, _VwEmptyplaceholder.frame.size.height/2);
    view.userInteractionEnabled=NO;
    view.tag=175751;

    //[self insertSubview:view belowSubview:btn];
}
-(void)setXPossitionto:(CGFloat)xpostion ofView:(UIView *)view
{
    CGRect frame =  view.frame;
    frame.origin.x =  xpostion;
    view.frame=frame;
}

-(void)setYPossitionto:(CGFloat)ypostion ofView:(UIView *)view
{
    CGRect frame =  view.frame;
    frame.origin.y =  ypostion;
    view.frame=frame;
}

-(void)setWidth:(CGFloat)Width ofView:(UIView *)view
{
    CGRect frame =  view.frame;
    frame.size.width =  Width;
    view.frame=frame;
}

-(void)setHeight:(CGFloat)Height ofView:(UIView *)view
{
    CGRect frame =  view.frame;
    frame.size.height =  Height;
    view.frame=frame;
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

@end