[iOSUI进阶-2.4]彩票Demov1.4转盘动画

2019-11-14 19:38:41

字体：大中小

来源：转载

供稿：网友

A.需求

幸运广场界面中有一个幸运转盘，平时能够自动缓缓转动
能够选择星座
点击“开始选号”开速旋转转盘，旋转一定周数
转盘转动速度节奏：开始-慢-块-慢-结束
设置其余的背景和按钮

code source:

彩票Demo https://github.com/hellovoidworld/HelloLottery

转盘Demo https://github.com/hellovoidworld/LuckyWheelDemo

B.实现

1.使用xib设计转盘

2.自定义类

（1）自定义一个继承UIVIew的类来控制这个转盘

（2）自定义一个继承UIButton的类来表示12星座按钮

3.给转盘添加12星座按钮

（1）先添加12个按钮重叠在12点方向

在awakeFromNib中添加子控件

 1 - (void)awakeFromNib { 2     // 由于按钮是要作为“转盘”控件的子控件，所以为了能够传递点击事件，要先开启“转盘”(UIImageView)的交互功能 3     self.luckyWheel.userInteractionEnabled = YES; 4     5     // 添加12个星座按钮 6     for (int i=0; i<12; i++) { 7         8         // 添加按钮 9         HVWLuckyWheelButton *button = [[HVWLuckyWheelButton alloc] init];10         button.backgroundColor = [UIColor redColor];11        12         // 设置按钮尺寸13         button.bounds = CGRectMake(0, 0, 68, 143);14         // 设置按钮锚点，用于分布环形12个按钮15         button.layer.anchorPoint = CGPointMake(0.5, 1);16         // 暂时把所有按钮都放在12点位置17         button.layer.position = CGPointMake(self.center.x, self.center.y);18        19         [self.luckyWheel addSubview:button];20     }21 }

（2）因为设置好了锚点，让12星座按钮旋转，平均排列在转盘上

1         // 环形分布12个星座按钮，围绕着锚点旋转2         button.transform = CGAffineTransformMakeRotation(M_PI/6 * i);

（3）裁剪星座图片

星座图片原图

注意裁剪图片用的CG框架方法使用的单位是px像素，而UIImage用的是pt点（可以自动识别@2x），所以要根据屏幕分辨率来判别星座小图的裁剪大小。

 1 - (void)awakeFromNib { 2     // 由于按钮是要作为“转盘”控件的子控件，所以为了能够传递点击事件，要先开启“转盘”(UIImageView)的交互功能 3     self.luckyWheel.userInteractionEnabled = YES; 4     5     // 添加12个星座按钮 6     for (int i=0; i<12; i++) { 7         8         // 添加按钮 9         HVWLuckyWheelButton *button = [[HVWLuckyWheelButton alloc] init];10         button.backgroundColor = [UIColor redColor];11        12         // 设置按钮尺寸13         button.bounds = CGRectMake(0, 0, 68, 143);14         // 设置按钮锚点，用于分布环形12个按钮15         button.layer.anchorPoint = CGPointMake(0.5, 1);16         // 暂时把所有按钮都放在12点位置17         button.layer.position = CGPointMake(self.center.x, self.center.y);18        19        20         // 取得星座图片总图21         UIImage *sumImage = [UIImage imageNamed:@"LuckyAstrology"];22         UIImage *sumImageSelected = [UIImage imageNamed:@"LuckyAstrologyPRessed"];23        24         // 使用CoreGraphic分割图片，得到独立的星座小图25         // 这里图片的大小是提供给CGImageCreateWithImageInRect裁剪图片用的，所以要把单位从pt转换成px26         // 根据屏幕的分辨率来判别系统是否使用了@2x图片27         CGFloat conImageWidth = sumImage.size.width / 12 * [UIScreen mainScreen].scale;28         CGFloat conImageHeight = sumImage.size.height * [UIScreen mainScreen].scale;29         CGFloat conImageX = i * conImageWidth;30         CGFloat conImageY = 0;31        32         // CGImage是用像素px来测量的，不是点pt，所以不能自动识别普通图片和@2x图片33         UIImage *conImage = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(sumImage.CGImage, CGRectMake(conImageX, conImageY, conImageWidth, conImageHeight))];34        35         UIImage *conImageSelected = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(sumImageSelected.CGImage, CGRectMake(conImageX, conImageY, conImageWidth, conImageHeight))];36        37         // 设置按钮图片38         [button setImage:conImage forState:UIControlStateNormal];39         [button setImage:conImageSelected forState:UIControlStateSelected];40         [button setBackgroundImage:[UIImage imageNamed:@"LuckyRototeSelected"] forState:UIControlStateSelected];41 42         // 按钮点击事件43         [button addTarget:self action:@selector(conButtonClicked:) forControlEvents:UIControlEventTouchDown];44        45         // 环形分布12个星座按钮，围绕着锚点旋转46         button.transform = CGAffineTransformMakeRotation(M_PI/6 * i);47 48         // 默认选中第一个按钮49         if (0 == i) {50             [self conButtonClicked:button];51         }52        53         [self.luckyWheel addSubview:button];54     }55 }56 57 /** 星座按钮点击事件 */58 - (void) conButtonClicked:(UIButton *) button {59     self.selectedLuckyWheelButton.selected = NO;60     button.selected = YES;61     self.selectedLuckyWheelButton = button;62 }

（4）裁剪出来的图片太大了，在自定义星座按钮类中重新初始化按钮图片

 1 // 2 //  HVWLuckyWheelButton.m 3 //  LotteryLuckyWheel 4 // 5 //  Created by hellovoidworld on 15/1/16. 6 //  Copyright (c) 2015年 hellovoidworld. All rights reserved. 7 // 8  9 #import "HVWLuckyWheelButton.h"10 11 @implementation HVWLuckyWheelButton12 13 /** 按钮前景图image的位置尺寸初始化 */14 - (CGRect)imageRectForContentRect:(CGRect)contentRect {15     CGFloat width = 40;16     CGFloat height = 47;17    18     // 这里一定要用contentRect来取得按钮的尺寸，不能使用self.frame19     CGFloat x = (contentRect.size.width - width)/2;20    21     CGFloat y = 30;22     return CGRectMake(x, y, width, height);23 }24 25 /** 取消选中效果 */26 - (void)setHighlighted:(BOOL)highlighted {27     // 置空28 }29 30 @end

4.让转盘转动起来

 1 /** 开始转盘旋转 */ 2 - (void) startRotate { 3     if (self.displayLink) return; 4     5     // 创建循环刷新事件 6     CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(luckyWheelRotate)]; 7     self.displayLink = link; 8     9     // 加入到主循环10     [link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];11 }12  13 /** 转盘旋转实现方法 */14 - (void) luckyWheelRotate {15     self.luckyWheel.transform = CGAffineTransformRotate(self.luckyWheel.transform, M_PI_4 / 100);16 }17  18 /** 停止转盘旋转 */19 - (void) stopRotate {20     [self.displayLink invalidate];21     self.displayLink = nil;22 }

5.“开始选号”按钮

转盘加速旋转

 1 /**  开始选号  2 * 因为点击“开始选号”之后仅播放动画，不用设计交互操作，所以可以用CALayer动画来完成 3 */ 4 - (IBAction)startChoose { 5     // 禁止再次点击 6     self.startChooseButton.userInteractionEnabled = NO; 7     8     // 先停止原来的轮盘转动 9     [self stopRotate];10 11     // 停止轮盘的交互功能12     self.luckyWheel.userInteractionEnabled = NO;13    14     CABasicAnimation *anim = [[CABasicAnimation alloc] init];15     anim.keyPath = @"transform.rotation";16 17     // 使用反余弦函数和矩阵换算计算出转盘现在的旋转角度18     CGFloat wheelRoate = acosf(self.luckyWheel.transform.a);19     if (self.luckyWheel.transform.b < 0) {    // 超出180°的情况20         wheelRoate = M_PI * 2 - wheelRoate;21     }22    23     // 狂转3周，回到原来的位置24     anim.toValue = @(wheelRoate + M_PI * 2 * 3);25     anim.duration = 2.0;26    27     // 设置代理28     anim.delegate = self;29    30     //使用慢进慢出的动画节奏31     anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaSEOut];32    33     [self.luckyWheel.layer addAnimation:anim forKey:nil];34 }35 36 /**  CALayer动画停止之后 */37 - (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {38     // 恢复轮盘的交互功能39     self.luckyWheel.userInteractionEnabled = YES;40    41     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{42         // 稍后恢复轮盘自动转动43         [self startRotate];44        45         // 恢复“开始选号”按钮点击46         self.startChooseButton.userInteractionEnabled = YES;47     });48 }

6.放到彩票Demo中，添加上背景和按钮

 1 // 2 //  HVWLuckyViewController.m 3 //  HelloLottery 4 // 5 //  Created by hellovoidworld on 15/1/16. 6 //  Copyright (c) 2015年 hellovoidworld. All rights reserved. 7 // 8  9 #import "HVWLuckyViewController.h"10 #import "HVWLuckyWheel.h"11 12 @interface HVWLuckyViewController ()13 14 @end15 16 @implementation HVWLuckyViewController17 18 - (void)viewDidLoad {19     [super viewDidLoad];20     // Do any additional setup after loading the view.21    22     [self setEdgesForExtendedLayout:UIRectEdgeNone];23    24     // 加载背景25     // 由于是jpg格式，不能使用imageNamed在iameges.xcassets中寻找26     NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"LuckyBackground" ofType:@"jpg"];27     [self.view setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageWithContentsOfFile:imagePath]]];28    29     // 加载转盘30     HVWLuckyWheel *luckyWheel = [HVWLuckyWheel hvwLuckyWheel];31     luckyWheel.center = CGPointMake(self.view.frame.size.width/2, 220);32     [luckyWheel startRotate];33    34     [self.view addSubview:luckyWheel];35 }36 37 - (void)didReceiveMemoryWarning {38     [super didReceiveMemoryWarning];39     // Dispose of any resources that can be recreated.40 }41 42 /*43 #pragma mark - Navigation44 45 // In a storyboard-based application, you will often want to do a little preparation before navigation46 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {47     // Get the new view controller using [segue destinationViewController].48     // Pass the selected object to the new view controller.49 }50 */51 52 @end