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;
/