直播点赞,上升的动画-- CAKeyFrameAnimation

// ViewController.m

// DMHeartFlyAnimation

// Created by Rick on 16/3/9.

#import "ViewController.h"

#import "DMHeartFlyView.h"

@interface ViewController ()

{

CGFloat _heartSize;

NSTimer *_burstTimer;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

_heartSize = 36;

self.view.backgroundColor = [UIColor lightGrayColor];

self.view.userInteractionEnabled = YES;

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(showTheLove)];

[self.view addGestureRecognizer:tapGesture];

UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressGesture:)];

longPressGesture.minimumPressDuration = 0.2;

[self.view addGestureRecognizer:longPressGesture];

}

//点击

-(void)showTheLove{

DMHeartFlyView* heart = [[DMHeartFlyView alloc]initWithFrame:CGRectMake(0, 0, _heartSize, _heartSize)];

[self.view addSubview:heart];

CGPoint fountainSource = CGPointMake(20 + _heartSize/2.0, self.view.bounds.size.height - _heartSize/2.0 - 10);

heart.center = fountainSource;//创建的地方

[heart animateInView:self.view];

}

//长按

-(void)longPressGesture:(UILongPressGestureRecognizer *)longPressGesture{

switch (longPressGesture.state) {

case UIGestureRecognizerStateBegan:

_burstTimer = [NSTimer scheduledTimerWithTimeInterval:0.2 target:self selector:@selector(showTheLove) userInfo:nil repeats:YES];

break;

case UIGestureRecognizerStateEnded:

[_burstTimer invalidate];

_burstTimer = nil;

break;

default:

break;

}

@end

////////////////////////////////////////////////////////////////////////////////////////////////////////////////

// DMHeartFlyView.h

// DMHeartFlyAnimation

// Created by Rick on 16/3/9.

#import <Foundation/Foundation.h>

#import <UIKit/UIKit.h>

@interface DMHeartFlyView : UIView

-(void)animateInView:(UIView *)view;

@end

// DMHeartFlyView.m

// DMHeartFlyAnimation

// Created by Rick on 16/3/9.

#define DMRGBColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1]

#define DMRGBAColor(r, g, b ,a) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:a]

#define DMRandColor DMRGBColor(arc4random_uniform(255), arc4random_uniform(255), arc4random_uniform(255))

#import "DMHeartFlyView.h"

//@interface DMHeartTheme ()

//@end

//@implementation DMHeartTheme

//@end

@interface DMHeartFlyView ()

@property(nonatomic,strong) UIColor *strokeColor;

@property(nonatomic,strong) UIColor *fillColor;

@end

@implementation DMHeartFlyView

-(instancetype)initWithFrame:(CGRect)frame{

self = [super initWithFrame:frame];

if (self) {

_strokeColor = [UIColor whiteColor];

_fillColor = DMRandColor;

self.backgroundColor = [UIColor clearColor];

self.layer.anchorPoint = CGPointMake(0.5, 1);

}

return self;

}

static CGFloat PI = M_PI;

-(void)animateInView:(UIView *)view{

NSTimeInterval totalAnimationDuration = 6;

CGFloat heartSize = CGRectGetWidth(self.bounds);

CGFloat heartCenterX = self.center.x;

CGFloat viewHeight = CGRectGetHeight(view.bounds);

//Pre-Animation setup

self.transform = CGAffineTransformMakeScale(0, 0);

self.alpha = 0;

//Bloom弹簧效果

[UIView animateWithDuration:0.5 delay:0.0 usingSpringWithDamping:0.6 initialSpringVelocity:0.8 options:UIViewAnimationOptionCurveEaseOut animations:^{

self.transform = CGAffineTransformIdentity;

self.alpha = 0.9;

} completion:NULL];

NSInteger i = arc4random_uniform(2);

NSInteger rotationDirection = 1- (2*i);// -1 OR 1

NSInteger rotationFraction = arc4random_uniform(10);

[UIView animateWithDuration:totalAnimationDuration animations:^{

self.transform = CGAffineTransformMakeRotation(rotationDirection * PI/(16 + rotationFraction*0.2));

} completion:NULL];

//上升路径

UIBezierPath *heartTravelPath = [UIBezierPath bezierPath];

[heartTravelPath moveToPoint:self.center];

//random end point

CGPoint endPoint = CGPointMake(heartCenterX + (rotationDirection) * arc4random_uniform(2*heartSize), viewHeight/6.0 + arc4random_uniform(viewHeight/4.0));

//random Control Points

NSInteger j = arc4random_uniform(2);

NSInteger travelDirection = 1- (2*j);// -1 OR 1

//randomize x and y for control points

CGFloat xDelta = (heartSize/2.0 + arc4random_uniform(2*heartSize)) * travelDirection;

CGFloat yDelta = MAX(endPoint.y ,MAX(arc4random_uniform(8*heartSize), heartSize));

CGPoint controlPoint1 = CGPointMake(heartCenterX + xDelta, viewHeight - yDelta);

CGPoint controlPoint2 = CGPointMake(heartCenterX - 2*xDelta, yDelta);

//上升的曲线

[heartTravelPath addCurveToPoint:endPoint controlPoint1:controlPoint1 controlPoint2:controlPoint2];

CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];

keyFrameAnimation.path = heartTravelPath.CGPath;

keyFrameAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];

keyFrameAnimation.duration = totalAnimationDuration + endPoint.y/viewHeight;

[self.layer addAnimation:keyFrameAnimation forKey:@"positionOnPath"];

//Alpha & remove from superview

[UIView animateWithDuration:totalAnimationDuration animations:^{

self.alpha = 0.0;

} completion:^(BOOL finished) {

[self removeFromSuperview];

}];

}

-(void)drawRect:(CGRect)rect{

// UIImage *heartImage = [UIImage imageNamed:@"heart"];

// UIImage *heartImageBorder = [UIImage imageNamed:@"heartBorder"];

// //Draw background image (mimics border)

// UIGraphicsBeginImageContextWithOptions(heartImageBorder.size, NO, 0.0f);

// [_strokeColor setFill];

// CGRect bounds = CGRectMake(0, 0, heartImageBorder.size.width, heartImageBorder.size.height);

// UIRectFill(bounds);

// [heartImageBorder drawInRect:rect blendMode:kCGBlendModeNormal alpha:1.0];

// heartImageBorder = UIGraphicsGetImageFromCurrentImageContext();

// UIGraphicsEndImageContext();

// //Draw foreground heart image

// UIGraphicsBeginImageContextWithOptions(heartImage.size, NO, 0.0f);

// [_fillColor setFill];

// CGRect bounds1 = CGRectMake(0, 0, heartImage.size.width, heartImage.size.height);

// UIRectFill(bounds1);

// [heartImage drawInRect:rect blendMode:kCGBlendModeNormal alpha:1.0];

// heartImage = UIGraphicsGetImageFromCurrentImageContext();

// UIGraphicsEndImageContext();

[self drawHeartInRect:rect];

}

//画心

-(void)drawHeartInRect:(CGRect)rect{

[_strokeColor setStroke];

[_fillColor setFill];

CGFloat drawingPadding = 4.0;

CGFloat curveRadius = floor((CGRectGetWidth(rect) - 2*drawingPadding) / 4.0);

//Creat path

UIBezierPath *heartPath = [UIBezierPath bezierPath];

//1.Start at bottom heart tip// floor()向下取整

CGPoint tipLocation = CGPointMake(floor(CGRectGetWidth(rect) / 2.0), CGRectGetHeight(rect) - drawingPadding);

[heartPath moveToPoint:tipLocation];//起点

//2.Move to top left start of curve

CGPoint topLeftCurveStart = CGPointMake(drawingPadding, floor(CGRectGetHeight(rect) / 2.4));

[heartPath addQuadCurveToPoint:topLeftCurveStart controlPoint:CGPointMake(topLeftCurveStart.x, topLeftCurveStart.y + curveRadius)];////画二元曲线，一般和moveToPoint配合使用

//3.Create top left curve

[heartPath addArcWithCenter:CGPointMake(topLeftCurveStart.x + curveRadius, topLeftCurveStart.y) radius:curveRadius startAngle:PI endAngle:0 clockwise:YES];

//4.Create top right curve

CGPoint topRightCurveStart = CGPointMake(topLeftCurveStart.x + 2*curveRadius, topLeftCurveStart.y);

[heartPath addArcWithCenter:CGPointMake(topRightCurveStart.x + curveRadius, topRightCurveStart.y) radius:curveRadius startAngle:PI endAngle:0 clockwise:YES];

//5.Final curve to bottom heart tip

CGPoint topRightCurveEnd = CGPointMake(topLeftCurveStart.x + 4*curveRadius, topRightCurveStart.y);

[heartPath addQuadCurveToPoint:tipLocation controlPoint:CGPointMake(topRightCurveEnd.x, topRightCurveEnd.y + curveRadius)];

[heartPath fill];

heartPath.lineWidth = 1;

heartPath.lineCapStyle = kCGLineCapRound;

heartPath.lineJoinStyle = kCGLineCapRound;

[heartPath stroke];

}

@end