iOS开发雷达动画效果实现

<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">具体先看效果图</span>

直接上代码：

@interface CCRadarView : UIView/*当前雷达中心缩略图*/
@property (nonatomic,strong)UIImage * thumbnailImage;-(instancetype)initWithFrame:(CGRect)frame andThumbnail:(NSString *)thumbnailUrl;@end

@interface CCRadarView()@property (nonatomic,weak)CALayer * animationLayer;@end@implementation CCRadarView

</pre><pre name="code" class="objc"><pre name="code" class="objc">-(instancetype)initWithFrame:(CGRect)frame andThumbnail:(NSString *)thumbnailUrl{self = [super initWithFrame:frame];if (self) {[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(resume) name:UIApplicationDidBecomeActiveNotification object:nil];self.backgroundColor = [UIColor clearColor];self.thumbnailImage = [UIImage imageNamed:@"friends_default_portrait.png"];}return self;
}

- (void)drawRect:(CGRect)rect {[[UIColor clearColor] setFill];UIRectFill(rect);NSInteger pulsingCount = 3;//雷达上波纹的条数double animationDuration = 2;//一组动画持续的时间，直接决定了动画运行快慢。CALayer * animationLayer = [[CALayer alloc]init];self.animationLayer = animationLayer;for (int i = 0; i < pulsingCount; i++) {CALayer * pulsingLayer = [[CALayer alloc]init];pulsingLayer.frame = CGRectMake(0, 0, rect.size.width, rect.size.height);pulsingLayer.backgroundColor = [UIColor colorWithHexRGB:@"d2e5fb"].CGColor;//圈圈背景颜色，不设置则为透明。pulsingLayer.borderColor = [UIColor colorWithHexRGB:@"d2e5fb"].CGColor;pulsingLayer.borderWidth = 1.0;pulsingLayer.cornerRadius = rect.size.height/2;CAMediaTimingFunction * defaultCurve = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];CAAnimationGroup * animationGroup = [[CAAnimationGroup alloc]init];animationGroup.fillMode = kCAFillModeBoth;//因为雷达中每个圈圈的大小不一致，故需要他们在一定的相位差的时刻开始运行。animationGroup.beginTime = CACurrentMediaTime() + (double)i * animationDuration/(double)pulsingCount;animationGroup.duration = animationDuration;//每个圈圈从生成到消失使用时常，也即动画组每轮动画持续时常animationGroup.repeatCount = HUGE_VAL;//表示动画组持续时间为无限大，也即动画无限循环。animationGroup.timingFunction = defaultCurve;//雷达圆圈初始大小以及最终大小比率。CABasicAnimation * scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];scaleAnimation.autoreverses = NO;scaleAnimation.fromValue = [NSNumber numberWithDouble:0.2];scaleAnimation.toValue = [NSNumber numberWithDouble:1.0];//雷达圆圈在n个运行阶段的透明度，n为数组长度。CAKeyframeAnimation * opacityAnimation = [CAKeyframeAnimation animationWithKeyPath:@"opacity"];//雷达运行四个阶段不同的透明度。opacityAnimation.values = @[[NSNumber numberWithDouble:1.0],[NSNumber numberWithDouble:0.5],[NSNumber numberWithDouble:0.3],[NSNumber numberWithDouble:0.0]];//雷达运行的不同的四个阶段，为0.0表示刚运行，0.5表示运行了一半，1.0表示运行结束。opacityAnimation.keyTimes = @[[NSNumber numberWithDouble:0.0],[NSNumber numberWithDouble:0.25],[NSNumber numberWithDouble:0.5],[NSNumber numberWithDouble:1.0]];//将两组动画（大小比率变化动画，透明度渐变动画）组合到一个动画组。animationGroup.animations = @[scaleAnimation,opacityAnimation];[pulsingLayer addAnimation:animationGroup forKey:@"pulsing"];[animationLayer addSublayer:pulsingLayer];}[self.layer addSublayer:self.animationLayer];//以下部分为雷达中心的用户缩略图。雷达圈圈也是从该图中心发出。CALayer * thumbnailLayer = [[CALayer alloc]init];thumbnailLayer.backgroundColor = [UIColor whiteColor].CGColor;CGRect thumbnailRect = CGRectMake(0, 0, 46, 46);thumbnailRect.origin.x = (rect.size.width - thumbnailRect.size.width)/2.0;thumbnailRect.origin.y = (rect.size.height - thumbnailRect.size.height)/2.0;thumbnailLayer.frame = thumbnailRect;thumbnailLayer.cornerRadius = 23.0;thumbnailLayer.borderWidth = 1.0;thumbnailLayer.masksToBounds = YES;thumbnailLayer.borderColor = [UIColor whiteColor].CGColor;UIImage * thumbnail = self.thumbnailImage;thumbnailLayer.contents = (id)thumbnail.CGImage;[self.layer addSublayer:thumbnailLayer];}

<pre name="code" class="objc">// 动画因应用程序进入后台后会停止。故避免在重新激活程序时出现卡死假象。
- (void)resume{if (self.animationLayer) {[self.animationLayer removeFromSuperlayer];[self setNeedsDisplay];}
}-(void)dealloc{[[NSNotificationCenter defaultCenter]removeObserver:self];
}

</pre><pre name="code" class="objc">其中有个uicolor  (category)

</pre><pre name="code" class="objc"><pre name="code" class="objc">+ (UIColor *)colorWithHexRGB:(NSString *)rbg
{NSString *cString = [[rbg stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];if (cString.length < 6) {return [UIColor clearColor];}if ([cString hasPrefix:@"0X"]) {cString = [cString substringFromIndex:2];}if ([cString hasPrefix:@"#"]) {cString = [cString substringFromIndex:1];}if (cString.length != 6) {return [UIColor clearColor];}NSRange range = NSMakeRange(0, 2);NSString *rString = [cString substringWithRange:range];range.location = 2;NSString *gString = [cString substringWithRange:range];range.location = 4;NSString *bString = [cString substringWithRange:range];unsigned int red = 0;unsigned int green= 0;unsigned int blue = 0;[[NSScanner scannerWithString:rString] scanHexInt:&red];[[NSScanner scannerWithString:gString] scanHexInt:&green];[[NSScanner scannerWithString:bString] scanHexInt:&blue];return [UIColor colorWithRed:red/255.0 green:green/255.0 blue:blue/255.0 alpha:1.0];
}

@end

原帖地址： http://blog.csdn.net/zhangao0086/article/details/38170359

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