CASpringAnimation的使用

效果

源码

////  CASpringAnimationController.m//  Animations////  Created by YouXianMing on 16/1/19.//  Copyright © 2016年 YouXianMing. All rights reserved.//#import "CASpringAnimationController.h"#import "RangeValueView.h"#import "WxHxD.h"#import "UIView+SetRect.h"@interface CASpringAnimationController ()@property (nonatomic, strong) UIButton       *showView;@property (nonatomic, strong) RangeValueView *stiffnessView;@property (nonatomic, strong) RangeValueView *dampingView;@property (nonatomic, strong) RangeValueView *massView;@property (nonatomic, strong) RangeValueView *initialVelocityView;@end@implementation CASpringAnimationController- (void)setup {        [super setup];        [self initRangeViews];        [self initButton];}- (void)initButton {        CGFloat gap = Height - 60 - 40*4 - 64;        CGFloat width                    = 50.f;    self.showView                    = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, width, width)];    self.showView.center             = CGPointMake(self.contentView.middleX, 64 + gap / 2.f);    self.showView.backgroundColor    = [UIColor cyanColor];    self.showView.layer.cornerRadius = width / 2.f;    self.showView.x                  = Width / 2.f - 50;    [self.showView addTarget:self action:@selector(doAnimation) forControlEvents:UIControlEventTouchUpInside];    [self.contentView addSubview:self.showView];}- (void)doAnimation {        CASpringAnimation *springAnimation = [CASpringAnimation animationWithKeyPath:@"position.x"];    springAnimation.stiffness          = self.stiffnessView.currentValue;    springAnimation.mass               = self.massView.currentValue;    springAnimation.damping            = self.dampingView.currentValue;    springAnimation.initialVelocity    = self.initialVelocityView.currentValue;    springAnimation.duration           = springAnimation.settlingDuration;        springAnimation.fromValue    = @(Width / 2.f - 50);    springAnimation.toValue      = @(Width / 2.f + 50);    self.showView.layer.position = CGPointMake(Width / 2.f + 50, self.showView.layer.position.y);        [self.showView.layer addAnimation:springAnimation forKey:nil];}- (void)initRangeViews {        self.stiffnessView = [RangeValueView rangeValueViewWithFrame:CGRectMake(10, Height - 60, Width - 20, 0)                                                            name:@"硬度  Stiffness"                                                        minValue:10.f                                                        maxValue:200.f                                                    defaultValue:100.f];    [self.contentView addSubview:self.stiffnessView];            self.dampingView = [RangeValueView rangeValueViewWithFrame:CGRectMake(10, Height - 60 - 40, Width - 20, 0)                                                          name:@"阻尼  Damping"                                                      minValue:0.1f                                                      maxValue:10.f                                                  defaultValue:5.f];    [self.contentView addSubview:self.dampingView];            self.massView = [RangeValueView rangeValueViewWithFrame:CGRectMake(10, Height - 60 - 40*2, Width - 20, 0)                                                       name:@"质量  Mass"                                                   minValue:0.1                                                   maxValue:20.f                                               defaultValue:1.f];    [self.contentView addSubview:self.massView];            self.initialVelocityView = [RangeValueView rangeValueViewWithFrame:CGRectMake(10, Height - 60 - 40*3, Width - 20, 0)                                                                  name:@"速度  Velocity"                                                              minValue:-20.f                                                              maxValue:20.f                                                          defaultValue:0.f];    [self.contentView addSubview:self.initialVelocityView];}@end

细节