Cat learn iOS (40) UI Core Animation _ Jitter Effect _cakeyframeanimation

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Address: http://blog.csdn.net/u013357243?viewmode=contents

Effect:

Effect One:

Effect Two:

Code:

////NYVIEWCONTROLLER.M//Image jitter////Created by Apple on 15-5-8.//Copyright (c) 2015 Znycat. All rights reserved.//#import "NYViewController.h"  @interface nyviewcontroller ()@property(nonatomic,Weak)Uiimageview*iconview;@end @implementation nyviewcontroller -(Uiimageview*) iconview{if(_iconview = =Nil) {Uiimageview*iconview = [[Uiimageviewalloc]initwithimage:[UIImageimagenamed:@"Cat"]]; IconView. Center= Cgpointmake ( -, the); [ Self. ViewAddsubview:iconview]; _iconview = IconView;return_iconview; }return_iconview;} - (void) viewdidload{[SuperViewdidload]; [ SelfIconView];}//Start jitter-(void) Touchesbegan: (Nsset *) touches withevent: (uievent *) event{[ SelfPosition]; [ SelfRotation];}//Keyframe animation movement- (void) Position {//1. Create a core animationCakeyframeanimation *keyanima = [cakeyframeanimation animation];//1.1 Tell the system what animations to performKeyanima. KeyPath= @"Position";//Nsvalue *V1 = [Nsvalue valuewithcgpoint:cgpointmake (0)];Nsvalue *v1 = [Nsvalue valuewithcgpoint:cgpointmake ( -, -)]; Nsvalue *v2 = [Nsvalue valuewithcgpoint:cgpointmake ( -, -)]; Nsvalue *v3 = [Nsvalue valuewithcgpoint:cgpointmake ( -, -)]; Nsvalue *v4 = [Nsvalue valuewithcgpoint:cgpointmake ( -, -)]; Nsvalue *v5 = [Nsvalue valuewithcgpoint:cgpointmake ( -, -)]; Keyanima. Values= @[v1, v2, v3, V4, V5];//Keyanima.keytimes = @[@ (0.5), @ (0.5), @ (0.5)];Keyanima. Timingfunction= [Camediatimingfunction functionwithname:kcamediatimingfunctioneaseineaseout];//1.2 The state after the save execution is completed    //1.2.1 Do not delete animations after executionKeyanima. Removedoncompletion=NO;//1.2.2 Save up-to-date status after executionKeyanima. Fillmode= Kcafillmodeforwards;//1.3 Set animation timeKeyanima. Duration=2;//2. Watch when the animation starts and when it's doneKeyanima. Delegate= Self;//2. Add Core animations[ Self. IconView. LayerAddanimation:keyanima Forkey:Nil];}//Animation jitter effect Rotation- (void) Rotation {//1, creating a core animationCakeyframeanimation *keyanima = [cakeyframeanimation animation];//2, tell the system what animations to perform. Keyanima. KeyPath= @"Transform.rotation";//(-m_pi_4/90.0 * 5) indicates-5 degrees. Keyanima. Values= @[@ (-m_pi_4/90.0*5), @ (M_pi_4/90.0*5), @ (-m_pi_4/90.0*5)];//1.2.1 Do not delete animations after executionKeyanima. Removedoncompletion=NO;//1.2.2 Save up-to-date status after executionKeyanima. Fillmode= Kcafillmodeforwards;//Animation Execution TimeKeyanima. Duration=0.2;//Set the number of repetitions. Keyanima. RepeatCount= Maxfloat;//2. Add Core animations[ Self. IconView. LayerAddanimation:keyanima Forkey:Nil];}@end

Introduction to Cakeyframeanimation Frame animation

Capropertyanimation subclasses, the difference with cabasicanimation is that cabasicanimation can only change from one numeric value (Fromvalue) to another (Tovalue), And Cakeyframeanimation will use a nsarray to save these values

Attribute parsing:

Values: This is the Nsarray object. The elements inside are called "keyframes" (keyframe). The animated object displays each keyframe in the values array in the specified time (duration), in turn
Path: You can set a cgpathref\cgmutablepathref so that the layer moves along the path. Path only works on Calayer's anchorpoint and position. If you set the path, the values will be ignored
Keytimes: You can specify a corresponding point in time for the corresponding keyframe, and each time value in the range from 0 through 1.0,keytimes corresponds to each frame in values. When the keytimes is not set, the time of each keyframe is equally divided.
Cabasicanimation can be seen as a maximum of only 2 keyframes cakeyframeanimation

Usage steps:

1. Create a core animation

    CAKeyframeAnimation *keyAnima = [CAKeyframeAnimation animation];

1.1 Tell the system what animations to perform

@"position";    NSValue *v1 = [NSValue valueWithCGPoint:CGPointMake(100, 100)];    NSValue *v2 = [NSValue valueWithCGPoint:CGPointMake(250, 100)];    NSValue *v3 = [NSValue valueWithCGPoint:CGPointMake(250, 300)];    NSValue *v4 = [NSValue valueWithCGPoint:CGPointMake(100, 300)];    NSValue *v5 = [NSValue valueWithCGPoint:CGPointMake(100, 100)];    keyAnima.values = @[v1, v2, v3, v4, v5];    keyAnima.timingFunction =  [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

1.2 Save status after execution
1.2.1 Do not delete animations after execution finishes

keyAnima.removedOnCompletion = NO;

Save up-to-date status after 1.2.2 execution

  keyAnima.fillMode = kCAFillModeForwards;

1.3 Setting Animation time

 keyAnima.duration = 2;

2. Watch when the animation starts and when it's done

 keyAnima.delegateself;

2. Add core animations to Calayer

[selfaddAnimation:forKey:nil];

Cat learn iOS (40) UI Core Animation _ Jitter Effect _cakeyframeanimation