(素材源码)猫猫学iOS（四十六）之网易彩票幸运大转盘

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

素材源码地址：http://download.csdn.net/detail/u013357243/8713827

效果

代码：

NYWheel

NYWheel.h

//
//  NYWheel.h
//  网易彩票幸运大转盘
//
//  Created by apple on 15-5-18.
//  Copyright (c) 2015年 znycat. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface NYWheel : UIView

+ (instancetype)wheel;

// 提供两个方法供外界调用开始和结束动画

- (void)startRotating;
- (void)stopRotating;
@end

//
//  NYWheel.m
//  网易彩票幸运大转盘
//
//  Created by apple on 15-5-18.
//  Copyright (c) 2015年 znycat. All rights reserved.
//

#import "NYWheel.h"
#import "NYWheelButton.h"

@interface NYWheel()
/**
 *  转盘中间的图片
 */
@property (weak, nonatomic) IBOutlet UIImageView *centerWheel;

//中间的开始按钮
- (IBAction)startBtnClick:(id)sender;

/**
 *  定义属性记录当前选中的按钮
 */

@property (nonatomic, weak) UIButton *selectButton;

@property (nonatomic, strong) CADisplayLink *link;

@end

@implementation NYWheel

- (void)awakeFromNib
{

    // 0.让父控件可以交互
    self.centerWheel.userInteractionEnabled = YES;

    // 加载图片
    UIImage *norImage = [UIImage imageNamed:@"LuckyAstrology"];
    UIImage *selImage = [UIImage imageNamed:@"LuckyAstrologyPressed"];

    // 创建12个按钮添加到中间的轮盘上
    for (int index = 0; index < 12; index++) {
        // 1.创建按钮
        NYWheelButton *btn = [[NYWheelButton alloc] init];

        // 2.设置按钮选中状态的图片
        [btn setBackgroundImage:[UIImage imageNamed:@"LuckyRototeSelected"] forState:UIControlStateSelected];

        // 3.设置按钮的bounds
        btn.bounds = CGRectMake(0, 0, 68, 143);

        // 4.设置按钮的锚点
        btn.layer.anchorPoint = CGPointMake(0.5, 1);
        // 5.设置按钮的position
        btn.layer.position = CGPointMake(self.frame.size.width * 0.5, self.frame.size.height * 0.5);

        // 6然按钮围绕锚点旋转
        // 6.1计算按钮应该旋转的弧度
        CGFloat angle = (30 * index)/180.0 * M_PI;
        btn.transform = CGAffineTransformMakeRotation(angle);

        // 7.监听按钮的点击事件
        [btn addTarget:self action:@selector(update:) forControlEvents:UIControlEventTouchUpInside];

        // 获取当前是否是retain屏
        //        NSLog(@"%.1f", [UIScreen mainScreen].scale);

        // 8.切割图片,将切割好的图片设置到按钮上
        CGFloat imageH = NYImageHeight * [UIScreen mainScreen].scale;
        CGFloat imageW = NYImageWidth * [UIScreen mainScreen].scale;
        CGFloat imageY = 0;
        CGFloat imageX = index * imageW;
        CGRect rect = CGRectMake(imageX, imageY, imageW, imageH);
        // 8.1根据rect切割图片
        // CGImage中rect是当做像素来使用
        // UIKit 中是点坐标系
        // 坐标系的特点:如果在非retain屏上 1个点等于1个像素
        //   在retain屏上1个点等于2个像素
        // 剪切默认状态的图片
        CGImageRef norCGImageRef= CGImageCreateWithImageInRect(norImage.CGImage, rect);
        // 将切割好的图片转换为uiimage设置为按钮的背景
        [btn setImage:[UIImage imageWithCGImage:norCGImageRef]  forState:UIControlStateNormal];

        //   剪切选中状态图片
        CGImageRef selCGImageRef= CGImageCreateWithImageInRect(selImage.CGImage, rect);
        // 将切割好的图片转换为uiimage设置为按钮的背景
        [btn setImage:[UIImage imageWithCGImage:selCGImageRef]  forState:UIControlStateSelected];

        // 添加按钮到中间轮盘图片上
        [self.centerWheel addSubview:btn];
    }
}

- (void)update:(UIButton *)btn
{
    self.selectButton.selected = NO;

    btn.selected = YES;

    self.selectButton = btn;
}

- (void)startRotating
{
    //    self.centerWheel.transform = CGAffineTransformMakeRotation(2 * M_PI * 10);
    if (self.link != nil) return;

    CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(centerImageRotation)];
    [link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    self.link = link;
}

- (void)centerImageRotation
{

    self.centerWheel.transform = CGAffineTransformRotate(self.centerWheel.transform, M_PI_4/ 250);
}

- (void)stopRotating
{
    // 关闭定时器
    [self.link invalidate];
    self.link = nil;
}

+ (instancetype)wheel
{
    return [[[NSBundle mainBundle] loadNibNamed:@"NYWheel" owner:nil options:nil] lastObject];
}

- (IBAction)startBtnClick:(id)sender {
    // 禁止用户交互
    self.userInteractionEnabled = NO;

    CABasicAnimation *anima = [CABasicAnimation animation];
    anima.keyPath = @"transform.rotation";
    anima.toValue = @(2  * M_PI * 3);
    anima.duration = 3.0;
    anima.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    anima.delegate = self;
    [self.centerWheel.layer addAnimation:anima forKey:nil];

}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
{
    self.userInteractionEnabled = YES;
}

@end

NYWheelButton

NYWheelButton.h

//
//  NYWheelButton.h
//  网易彩票幸运大转盘
//
//  Created by apple on 15-5-18.
//  Copyright (c) 2015年 znycat. All rights reserved.
//

#import <UIKit/UIKit.h>
#define NYImageWidth 40
#define NYImageHeight 47

@interface NYWheelButton : UIButton

@end

//
//  NYWheelButton.m
//  网易彩票幸运大转盘
//
//  Created by apple on 15-5-18.
//  Copyright (c) 2015年 znycat. All rights reserved.
//

#import "NYWheelButton.h"

@implementation NYWheelButton

/**
重写按钮图片位置
 */
- (CGRect)imageRectForContentRect:(CGRect)contentRect
{
    CGFloat imageX = (contentRect.size.width - NYImageWidth ) * 0.5;
    CGFloat imageY = 18;
    return CGRectMake(imageX, imageY, NYImageWidth, NYImageHeight);
}

/**
什么也不做，就让按钮不会有高亮
 */
- (void)setHighlighted:(BOOL)highlighted
{

}

@end

NYViewController

//
//  NYViewController.m
//  网易彩票幸运大转盘
//
//  Created by apple on 15-5-18.
//  Copyright (c) 2015年 znycat. All rights reserved.
//

#import "NYViewController.h"
#import "NYWheel.h"

@interface NYViewController ()

- (IBAction)start:(id)sender;

- (IBAction)stop:(id)sender;

@property (nonatomic, weak) NYWheel *wheel;

@end

@implementation NYViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    NYWheel *wheel = [NYWheel wheel];
    wheel.center = CGPointMake(self.view.frame.size.width * 0.5, self.view.frame.size.height * 0.5);
    [self.view addSubview:wheel];
    self.wheel = wheel;
}

- (IBAction)start:(id)sender {
    [self.wheel startRotating];
}

- (IBAction)stop:(id)sender {
    [self.wheel stopRotating];
}

@end