iOS开发实现转盘功能

#pragma mark - 如果要旋转那就第一考虑锚点 核心动画看到的都是假象 真实的位置并没有发生改变//// ViewController.m// 5-网易转盘的实现//// Created by Jordan zhou on 2018/10/10.// Copyright © 2018年 Jordan zhou. All rights reserved.//#import "ViewController.h"#import "ZZWheelView.h"@interface ViewController ()/** 展示的view */@property (nonatomic, strong) ZZWheelView *wheelView;@end@implementation ViewController- (IBAction)start:(id)sender { [self.wheelView start];}- (IBAction)stop:(id)sender { [self.wheelView pause];}#pragma mark - 懒加载- (ZZWheelView *)wheelView{ if (!_wheelView) { _wheelView = [ZZWheelView wheelView]; _wheelView.center = self.view.center; } return _wheelView;}- (void)viewDidLoad { [super viewDidLoad]; [self.view addSubview:self.wheelView];}@end

//// ZZWheelView.h// 5-网易转盘的实现//// Created by Jordan zhou on 2018/10/10.// Copyright © 2018年 Jordan zhou. All rights reserved.//#import <UIKit/UIKit.h>@interface ZZWheelView : UIView+ (instancetype)wheelView;- (void)start;- (void)pause;@end// ZZWheelView.m// 5-网易转盘的实现//// Created by Jordan zhou on 2018/10/10.// Copyright © 2018年 Jordan zhou. All rights reserved.//#import "ZZWheelView.h"#import "ZZWheelButton.h"@interface ZZWheelView()<CAAnimationDelegate>@property (weak, nonatomic) IBOutlet UIImageView *centerView;@property (nonatomic, weak) UIButton *selBtn;@property (nonatomic, strong) CADisplayLink *link;@end@implementation ZZWheelView#pragma mark - 懒加载- (CADisplayLink *)link{ if (_link == nil) { _link = [CADisplayLink displayLinkWithTarget:self selector:@selector(angleChange)]; [_link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode]; } return _link;}+ (instancetype)wheelView{ return [[NSBundle mainBundle] loadNibNamed:@"ZZWheelView" owner:nil options:nil][0];}#warning - 注意这个方法只是加载xib的时候会调用，但是并没有连好线//- (instancetype)initWithCoder:(NSCoder *)aDecoder//{// if (self = [super initWithCoder:aDecoder]) {// NSLog(@"-%@",_centerView);// }// return self;//}- (void)awakeFromNib{ [super awakeFromNib];  _centerView.userInteractionEnabled = YES;  CGFloat btnW = 68; CGFloat btnH = 143; CGFloat wh = self.bounds.size.width;  // 加载大图片 UIImage *bigImage = [UIImage imageNamed:@"LuckyAstrology"];  // 加载大图片 UIImage *selBigImage = [UIImage imageNamed:@"LuckyAstrologyPressed"];  // 获取当前使用的图片像素和点的比例 CGFloat scale = [UIScreen mainScreen].scale; CGFloat imageW = bigImage.size.width / 12 * scale; CGFloat imageH = bigImage.size.height * scale; // CGImageRef image:需要裁减的图片 // rect：裁减区域 // 裁减区域是以像素为基准 // CGImageCreateWithImageInRect(CGImageRef image, CGRect rect)  // 添加按钮 for (int i = 0; i < 12; i++) { ZZWheelButton *btn = [ZZWheelButton buttonWithType:UIButtonTypeCustom];  // 设置按钮的位置 btn.layer.anchorPoint = CGPointMake(0.5, 1);  btn.bounds = CGRectMake(0, 0, btnW, btnH);  btn.layer.position = CGPointMake(wh * 0.5, wh * 0.5);  // 按钮的旋转角度 CGFloat radion = (30 * i) / 180.0 * M_PI;  btn.transform = CGAffineTransformMakeRotation(radion);  [_centerView addSubview:btn];  // 加载按钮的图片 // 计算裁减区域 CGRect clipR = CGRectMake(i * imageW, 0, imageW, imageH);  // 裁减图片 CGImageRef imgR = CGImageCreateWithImageInRect(bigImage.CGImage, clipR);  UIImage *image = [UIImage imageWithCGImage:imgR];  // 设置按钮的图片 [btn setImage:image forState:UIControlStateNormal];  // 设置选中状态下图片 imgR = CGImageCreateWithImageInRect(selBigImage.CGImage, clipR);  image = [UIImage imageWithCGImage:imgR];  // 设置按钮的图片 [btn setImage:image forState:UIControlStateSelected];  // 设置选中背景图片 [btn setBackgroundImage:[UIImage imageNamed:@"LuckyRototeSelected"] forState:UIControlStateSelected];  // 监听按钮的点击 [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];  // 默认选中第一个 if (i == 0) {  [self btnClick:btn]; } }}- (void)btnClick:(UIButton *)btn{ _selBtn.selected = NO; btn.selected = YES; _selBtn = btn;}#pragma mark - 开始旋转- (void)start{ self.link.paused = NO;}// 1.搞个定时器，每隔一段时间就旋转一定的角度，1秒旋转45°#pragma mark - 暂停旋转- (void)pause{ self.link.paused = YES;}#pragma mark - 每隔一段时间旋转一定的角度- (void)angleChange{ // 每一次调用旋转多少 45 / 60.0 CGFloat angle = (45 / 60.0) * M_PI / 180.0;  _centerView.transform = CGAffineTransformRotate(_centerView.transform, angle);}#pragma mark - 点击开始选号的时候- (IBAction)startPicker:(id)sender {  // 不需要定时器旋转 self.link.paused = YES;  // 中间的转盘快速的旋转，并且不需要与用户交互 CABasicAnimation *anim = [CABasicAnimation animation]; anim.keyPath = @"transform.rotation"; anim.toValue = @(M_PI * 2 * 3); anim.duration = 0.5; anim.delegate = self;  [_centerView.layer addAnimation:anim forKey:nil];  // 点击哪个星座，就把当前星座指向中心点上面  // M_PI 3.14 // 根据选中的按钮获取旋转的度数, // 通过transform获取角度 CGFloat angle = atan2(_selBtn.transform.b, _selBtn.transform.a);  // 旋转转盘 _centerView.transform = CGAffineTransformMakeRotation(-angle);}- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{ dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ self.link.paused = NO; });}@end

//// ZZWheelButton.m// 5-网易转盘的实现//// Created by Jordan zhou on 2018/10/10.// Copyright © 2018年 Jordan zhou. All rights reserved.//#import "ZZWheelButton.h"@implementation ZZWheelButton// 寻找最合适的view- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{ CGFloat btnW = self.bounds.size.width; CGFloat btnH = self.bounds.size.height;  CGFloat x = 0; CGFloat y = btnH / 2; CGFloat w = btnW; CGFloat h = y; CGRect rect = CGRectMake(x, y, w, h); if (CGRectContainsPoint(rect, point)) { return nil; }else{ return [super hitTest:point withEvent:event]; }}// 设置UIImageView的尺寸// contentRect:按钮的尺寸- (CGRect)imageRectForContentRect:(CGRect)contentRect{ // 计算UIImageView控件尺寸 CGFloat imageW = 40; CGFloat imageH = 46; CGFloat imageX = (contentRect.size.width - imageW) * 0.5; CGFloat imageY = 20; return CGRectMake(imageX, imageY, imageW, imageH);}// 取消高亮状态- (void)setHighlighted:(BOOL)highlighted{}@end