iOS开发实现转盘功能

本文实例为大家分享了iOS实现转盘功能的具体代码，供大家参考，具体内容如下

今天给同学们讲解一下一个转盘选号的功能，直接上代码直接看

ViewController

#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

//// 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 \\ 60.0CGFloat 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

//// 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

以上就是本文的全部内容，希望对大家的学习有所帮助