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 \ 60.0
 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

//
// 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，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/ZZ_IOSdeveloper/article/details/82998843