IOS 视图定点摇摆，X漂移，Y漂移，

image.png

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视频: http://www.iqiyi.com/w_19s053xjk9.html

//
//  ViewController.h
//  testRL
//
//  Created by yanjinlin on 2018/7/12.
//  Copyright © 2018年 yanjinlin. All rights reserved.
//

#import 
typedef NS_ENUM(NSInteger, AnimaType) {
    AnimaTypecenter = 0,
    AnimaTypeTop    = 1,
    AnimaTypeDown   = 2,
    
};

typedef NS_ENUM(NSInteger, AnimaXY) {
    AnimaXY_X       = 0,
    AnimaXY_Y       = 1,
};
@interface ViewController : UIViewController

@end

//
//  ViewController.m
//  testRL
//
//  Created by yanjinlin on 2018/7/12.
//  Copyright © 2018年 yanjinlin. All rights reserved.
//

#import "ViewController.h"
#define SCREEN_WIDTH  ([UIScreen mainScreen].bounds.size.width)
#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //X漂移
    UIImageView *backView1=[[UIImageView alloc]initWithFrame:CGRectMake(0, 100, 40, 40)];
    [self.view addSubview:backView1];
    backView1.image=[UIImage imageNamed:@"girl.jpg"];
    [self AnimaRepeatCount:0 AnimaXY:AnimaXY_X Formvalue:0 Tovalue:SCREEN_WIDTH animaView:backView1];
    
    //定点左右摇摆
    UIImageView *backView2=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 50, 100)];
    backView2.center = self.view.center;
    [self.view addSubview:backView2];
    backView2.image=[UIImage imageNamed:@"girl.jpg"];
    [self AnimaRepeatCount:0 animatype:AnimaTypeTop animaduration:1.0 animaView:backView2];
   
    
    //Y漂移
    UIImageView *backView3=[[UIImageView alloc]initWithFrame:CGRectMake(SCREEN_WIDTH/2, 0, 40, 40)];
    [self.view addSubview:backView3];
    backView3.image=[UIImage imageNamed:@"girl.jpg"];
    [self AnimaRepeatCount:0 AnimaXY:AnimaXY_Y Formvalue:0 Tovalue:SCREEN_HEIGHT animaView:backView3];
    
}




-(void)AnimaRepeatCount:(NSInteger)count AnimaXY:(AnimaXY)animaxy Formvalue:(NSInteger)formvalue Tovalue:(NSInteger)tovalue animaView:(UIView*)View{
    CABasicAnimation *Animation= [CABasicAnimation animation];    //定义动画
    //左右漂移
    if (animaxy ==0) {
         Animation=[CABasicAnimation animationWithKeyPath:@"transform.translation.x"];
    }else{
         Animation=[CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
    }
   
    Animation.fromValue = [NSNumber numberWithFloat:formvalue];
    Animation.toValue   = [NSNumber numberWithFloat:tovalue];
    Animation.duration     = 1;//动画持续时间
    if (count == 0) {
         Animation.repeatCount  = MAXFLOAT;//动画重复次数
    }else{
         Animation.repeatCount  = count;//动画重复次数
    }
   
    Animation.autoreverses = YES;//是否自动重复
    [View.layer addAnimation:Animation forKey:@"animateLayer"];

}


-(void)AnimaRepeatCount:(NSInteger)count animatype:(AnimaType)type animaduration:(float)duration animaView:(UIView*)View{
    CABasicAnimation *baseAnimation = [CABasicAnimation animation];
    //动画运动的方式，现在指定的是围绕Z轴旋转
    baseAnimation.keyPath = @"transform.rotation.z";
    //动画持续时间
    baseAnimation.duration = duration;
    //开始的角度
    baseAnimation.fromValue = [NSNumber numberWithFloat:-M_PI_4];
    //结束的角度
    baseAnimation.toValue = [NSNumber numberWithFloat:M_PI_4];
    //动画的运动方式
    baseAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    //是否反向移动动画
    baseAnimation.autoreverses = YES;
    //动画重复次数
    if (count==0) {
           baseAnimation.repeatCount  = MAXFLOAT;
    }else{
          baseAnimation.repeatCount  = count;
    }
    //动画的代理
        baseAnimation.delegate = self;
    //动画结束后的状态
    baseAnimation.fillMode = kCAFillModeForwards;
    
    [baseAnimation setValue:@"RightandLeft" forKey:@"Animation"];
    
    [View.layer addAnimation:baseAnimation forKey:@"Animation"];
    switch (type) {
        case 0:{
            View.layer.anchorPoint = CGPointMake(0.5, 0.5);//中间摆动
        }
            break;
        case 1:{
            View.layer.anchorPoint = CGPointMake(0.5, 1);//上面摆动
        }
            break;
        default:{
             View.layer.anchorPoint = CGPointMake(0.5, 0);//下面摆动
        }
            break;
    }
}

@end