本文实例为大家分享了iOS实现雷达扫描扩散动画的具体代码，供大家参考，具体内容如下
自己自定义了 一个雷达扫描/扩散效果的View。
扫描View 效果如下：
扩散View 效果如下：
自定义的代码如下：
1. RadarView.h
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#import <UIKit/UIKit.h> typedef NS_ENUM(NSInteger, RadarViewType) { RadarViewTypeScan, RadarViewTypeDiffuse}; @interface RadarView : UIView /** 雷达 空心圆圈的颜色 */@property (nonatomic, strong) UIColor * radarLineColor;/** 扇形开始颜色 必须由RGBA值初始化 * [UIColor colorWithRed: green: blue: alpha:] */@property (nonatomic, strong) UIColor * startColor;/** 扇形结束颜色 必须由RGBA值初始化 * [UIColor colorWithRed: green: blue: alpha:] */@property (nonatomic, strong) UIColor * endColor; /** * * @param radius 半径 * @param angle 角度 * @param radarLineNum 雷达线数量 * @param hollowRadius 空心圆半径 * * @return 扫描 雷达 View */+ (RadarView *)scanRadarViewWithRadius:(CGFloat)radius angle:(int)angle radarLineNum:(int)radarLineNum hollowRadius:(CGFloat)hollowRadius; /** * * @param startRadius 扩散圆 起始的半径 * @param endRadius 扩散圆 消失的半径 * @param circleColor 扩散圆 的颜色 * * @return 扩散 雷达 View */+ (RadarView *)diffuseRadarViewWithStartRadius:(CGFloat)startRadius endRadius:(CGFloat)endRadius circleColor:(UIColor *)circleColor; /** * 展示在targerView上 * * @param targerView <#targerView description#> */- (void)showTargetView:(UIView *)targerView; - (void)dismiss; /** 开始扫描动画 */- (void)startAnimatian; /** 停止扫描动画 */- (void)stopAnimation; @end |
2. RadarView.m
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#import "RadarView.h" #define CenterX self.bounds.size.width*0.5#define CenterY self.bounds.size.height*0.5 #define DefaultRadarLineColor [UIColor colorWithWhite:1 alpha:0.7]#define DefaultStartColor [UIColor colorWithRed:1 green:1 blue:1 alpha:0.5]#define DefaultEndColor [UIColor colorWithRed:1 green:1 blue:1 alpha:0] #define DefaultCircleColor [UIColor colorWithWhite:1 alpha:0.5] @interface RadarView () #pragma mark - 扫描类型的RadarView 属性/** 扇形半径 */@property (nonatomic, assign) CGFloat sectorRadius;/** 扇形 角度 */@property (nonatomic, assign) int angle;/** 雷达 空心圆圈的数量 */@property (nonatomic, assign) int radarLineNum;/** 中心 空心圆的半径 (一般 这里放置一个圆形的头像) */@property (nonatomic, assign) int hollowRadius; #pragma mark - 扩散类型的RadarView 属性/** 扩散动画 起始 的半径 */@property (nonatomic, assign) CGFloat startRadius;/** 扩散动画 结束 的半径 */@property (nonatomic, assign) CGFloat endRadius;/** 圆圈的颜色 */@property (nonatomic, strong) UIColor * circleColor; @property (nonatomic, strong) NSTimer * timer; @property (nonatomic, assign) RadarViewType radarViewType; @end @implementation RadarView + (RadarView *)scanRadarViewWithRadius:(CGFloat)radius angle:(int)angle radarLineNum:(int)radarLineNum hollowRadius:(CGFloat)hollowRadius { return [[self alloc] initWithRadius:radius angle:angle radarLineNum:radarLineNum hollowRadius:hollowRadius];} - (instancetype)initWithRadius:(CGFloat)radius angle:(int)angle radarLineNum:(int)radarLineNum hollowRadius:(CGFloat)hollowRadius { if (self = [super init]) { self.radarViewType = RadarViewTypeScan; self.sectorRadius = radius; self.frame = CGRectMake(0, 0, radius*2, radius*2); self.angle = angle; self.radarLineNum = radarLineNum-1; self.hollowRadius = hollowRadius; self.backgroundColor = [UIColor clearColor]; } return self;} + (RadarView *)diffuseRadarViewWithStartRadius:(CGFloat)startRadius endRadius:(CGFloat)endRadius circleColor:(UIColor *)circleColor { return [[self alloc] initWithStartRadius:startRadius endRadius:endRadius circleColor:circleColor];} - (instancetype)initWithStartRadius:(CGFloat)startRadius endRadius:(CGFloat)endRadius circleColor:(UIColor *)circleColor { if (self = [super init]) { self.radarViewType = RadarViewTypeDiffuse; self.frame = CGRectMake(0, 0, endRadius*2, endRadius*2); self.startRadius = startRadius; self.endRadius = endRadius; self.circleColor = circleColor; self.backgroundColor = [UIColor clearColor]; } return self;} // Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect { // Drawing code if (_radarViewType == RadarViewTypeScan) { if (!_startColor) { _startColor = DefaultStartColor; } if (!_endColor) { _endColor = DefaultEndColor; } if (!_radarLineColor) { _radarLineColor = DefaultRadarLineColor; } // 画雷达线 [self drawRadarLine]; CGContextRef context = UIGraphicsGetCurrentContext(); // 把要画的扇形 分开画，一次画1°,每次的颜色渐变 for (int i = 0; i < _angle; i++) { UIColor * color = [self colorWithCurrentAngleProportion:i*1.0/_angle]; [self drawSectorWithContext:context color:color startAngle:-90-i]; } }} /** 画扇形 */- (void)drawSectorWithContext:(CGContextRef)context color:(UIColor *)color startAngle:(CGFloat)startAngle { //画扇形，也就画圆，只不过是设置角度的大小，形成一个扇形 CGContextSetFillColorWithColor(context, color.CGColor);//填充颜色 CGContextSetLineWidth(context, 0);//线的宽度 //以self.radius为半径围绕圆心画指定角度扇形 CGContextMoveToPoint(context, CenterX, CenterY); CGContextAddArc(context, CenterX, CenterY, _sectorRadius, startAngle * M_PI / 180, (startAngle-1) * M_PI / 180, 1); CGContextClosePath(context); CGContextDrawPath(context, kCGPathFillStroke); //绘制路径} /** 画雷达线 */- (void)drawRadarLine { CGFloat minRadius = (_sectorRadius-_hollowRadius)*(pow(0.618, _radarLineNum-1)); /** 画 围着空心半径的第一个空心圆，此圆不在计数内 */ [self drawLineWithRadius:_hollowRadius+minRadius*0.382]; for (int i = 0; i < _radarLineNum; i++) { [self drawLineWithRadius:_hollowRadius + minRadius/pow(0.618, i)]; }} /** 画空心圆 */- (void)drawLineWithRadius:(CGFloat)radius { CAShapeLayer *solidLine = [CAShapeLayer layer]; CGMutablePathRef solidPath = CGPathCreateMutable(); solidLine.lineWidth = 1.0f ; solidLine.strokeColor = _radarLineColor.CGColor; solidLine.fillColor = [UIColor clearColor].CGColor; CGPathAddEllipseInRect(solidPath, nil, CGRectMake(self.bounds.size.width*0.5-radius, self.bounds.size.height*0.5-radius, radius*2, radius*2)); solidLine.path = solidPath; CGPathRelease(solidPath); [self.layer addSublayer:solidLine];} #pragma mark - 展示- (void)showTargetView:(UIView *)targerView { self.center = targerView.center; [targerView addSubview:self];} #pragma mark - - (void)dismiss { [self removeFromSuperview];} #pragma mark - 开始动画- (void)startAnimatian { if (_radarViewType == RadarViewTypeScan) { CABasicAnimation* rotationAnimation; rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; rotationAnimation.toValue = [NSNumber numberWithFloat: 1 * M_PI * 2.0 ]; rotationAnimation.duration = 2; rotationAnimation.cumulative = YES; rotationAnimation.repeatCount = INT_MAX; [self.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"]; } else { [self diffuseAnimation]; _timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(diffuseAnimation) userInfo:nil repeats:YES]; }} #pragma mark - 结束动画- (void)stopAnimation { if (_radarViewType == RadarViewTypeScan) { [self.layer removeAnimationForKey:@"rotationAnimation"]; } else { [_timer invalidate]; _timer = nil; }} - (UIColor *)colorWithCurrentAngleProportion:(CGFloat)angleProportion { NSArray * startRGBA = [self RGBA_WithColor:_startColor]; NSArray * endRGBA = [self RGBA_WithColor:_endColor]; CGFloat currentR = [startRGBA[0] floatValue] - ([startRGBA[0] floatValue]-[endRGBA[0] floatValue]) * angleProportion; CGFloat currentG = [startRGBA[1] floatValue] - ([startRGBA[1] floatValue]-[endRGBA[1] floatValue]) * angleProportion; CGFloat currentB = [startRGBA[2] floatValue] - ([startRGBA[2] floatValue]-[endRGBA[2] floatValue]) * angleProportion; CGFloat currentA = [startRGBA[3] floatValue] - ([startRGBA[3] floatValue]-[endRGBA[3] floatValue]) * angleProportion; return [UIColor colorWithRed:currentR green:currentG blue:currentB alpha:currentA];} /** * 将UIColor对象解析成RGBA 值 的数组 * * @param color UIColor对象，有RGBA值 初始化的 *[UIColor colorWithRed:rValue green:gValue blue:bValue alpha:aValue] * * @return 包含RGBA值得数组[rValue, gValue, bValue, aValue] */- (NSArray *)RGBA_WithColor:(UIColor *)color { NSString * colorStr = [NSString stringWithFormat:@"%@", color]; //将RGB值描述分隔成字符串 NSArray * colorValueArray = [colorStr componentsSeparatedByString:@" "]; NSString * R = colorValueArray[1]; NSString * G = colorValueArray[2]; NSString * B = colorValueArray[3]; NSString * A = colorValueArray[4]; return @[R, G, B, A];} /** 画圆 */- (UIImage *)drawCircle { UIGraphicsBeginImageContext(CGSizeMake(_endRadius*2, _endRadius*2)); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextMoveToPoint(context, CenterX, CenterY); CGContextSetFillColorWithColor(context, _circleColor.CGColor); CGContextAddArc(context, CenterX, CenterY, _endRadius, 0, -2*M_PI, 1); CGContextFillPath(context); UIImage * img = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return img;} - (void)diffuseAnimation { UIImageView * imgView = [[UIImageView alloc] init]; imgView.image = [self drawCircle]; imgView.frame = CGRectMake(0, 0, _startRadius, _startRadius); imgView.center = CGPointMake(CenterX, CenterY); [self addSubview:imgView]; [UIView animateWithDuration:2 delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{ imgView.frame = CGRectMake(0, 0, _endRadius*2, _endRadius*2); imgView.center = CGPointMake(CenterX, CenterY); imgView.alpha = 0; } completion:^(BOOL finished) { [imgView removeFromSuperview]; }];} @end |
3. ViewController.m 中使用的代码：
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#import "ViewController.h"#import "RadarView.h" @interface ViewController () @property (nonatomic, strong) RadarView * scanRadarView;@property (nonatomic, strong) RadarView * diffuseRadarView; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; /** 扫描 类型 RadarView */// _scanRadarView = [RadarView scanRadarViewWithRadius:self.view.bounds.size.width*0.5 angle:400 radarLineNum:5 hollowRadius:0]; /** 扩散 类型 RadarView */ _diffuseRadarView = [RadarView diffuseRadarViewWithStartRadius:7 endRadius:self.view.bounds.size.width*0.5 circleColor:[UIColor whiteColor]];} - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; // [_scanRadarView showTargetView:self.view];// [_scanRadarView startAnimatian]; [_diffuseRadarView showTargetView:self.view]; [_diffuseRadarView startAnimatian];} - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.} @end |
现在定义的是能代码加载使用，等有空了，再封装一些方法能在Storyboard中直接使用。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/CBlog_life/article/details/60324262
