本文实例为大家分享了ios实现转盘效果的具体代码，供大家参考，具体内容如下
demo下载地址： ios转盘效果
功能：实现了常用的ios转盘效果，轮盘抽奖效果的实现，转盘可以暂停，旋转，已经快速旋转抽奖，选中的效果指向正上方。
效果图：
工程文件目录：
核心代码：
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//// viewcontroller.m// 转盘效果//// created by llkj on 2017/8/31.// copyright © 2017年 laynecheung. all rights reserved.//#import "viewcontroller.h"#import "wheelview.h"@interface viewcontroller ()@property (nonatomic, weak) wheelview *wheelv;@end@implementation viewcontroller- (void)viewdidload { [super viewdidload]; wheelview *wheelv = [wheelview wheelview]; wheelv.center = self.view.center; self.wheelv = wheelv; [self.view addsubview:wheelv];}- (ibaction)rotation:(id)sender { [self.wheelv rotation];}- (ibaction)stop:(id)sender { [self.wheelv stop];}- (void)didreceivememorywarning { [super didreceivememorywarning]; // dispose of any resources that can be recreated.}@end |
wheelview文件
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//// wheelview.h// 转盘效果//// created by llkj on 2017/8/31.// copyright © 2017年 laynecheung. all rights reserved.//#import <uikit/uikit.h>@interface wheelview : uiview+ (instancetype)wheelview;- (void)rotation;- (void)stop;@end |
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//// wheelview.m// 转盘效果//// created by llkj on 2017/8/31.// copyright © 2017年 laynecheung. all rights reserved.//#import "wheelview.h"#import "wheelbtn.h"#define angle2rad(angle) ((angle) / 180.0 * m_pi)@interface wheelview ()<caanimationdelegate>@property (weak, nonatomic) iboutlet uiimageview *contentv;@property (nonatomic, weak) uibutton *selectbtn;@property (nonatomic, strong) cadisplaylink *link;@end@implementation wheelview- (cadisplaylink *)link { if (_link == nil) { cadisplaylink *link = [cadisplaylink displaylinkwithtarget:self selector:@selector(update)]; [link addtorunloop:[nsrunloop mainrunloop] formode:nsdefaultrunloopmode]; _link = link; } return _link;}+ (instancetype)wheelview { return [[[nsbundle mainbundle] loadnibnamed:@"wheelview" owner:nil options:nil] lastobject];}- (instancetype)initwithframe:(cgrect)frame{ self = [super initwithframe:frame]; if (self) { self = [[[nsbundle mainbundle] loadnibnamed:@"wheelview" owner:nil options:nil] lastobject]; } return self;}- (void)awakefromnib { [super awakefromnib]; cgfloat btnw = 68; cgfloat btnh = 143; cgfloat angle = 0; //加载原始大图片 uiimage *oriimage = [uiimage imagenamed:@"luckyastrology"]; //加载原始选中的大图片 uiimage *oriselimg = [uiimage imagenamed:@"luckyastrologypressed"]; cgfloat x = 0; cgfloat y = 0; cgfloat sacle = [uiscreen mainscreen].scale; cgfloat clipw = oriimage.size.width / 12.0 * sacle; cgfloat cliph = oriimage.size.height * sacle; for (int i = 0; i < 12; i ++) { wheelbtn *btn = [wheelbtn buttonwithtype:uibuttontypecustom]; btn.bounds = cgrectmake(0, 0, btnw, btnh); //按钮正常状态图片 x = i * clipw; //给定一张图片截取指定区域内的图片 cgimageref clipimg = cgimagecreatewithimageinrect(oriimage.cgimage, cgrectmake(x, y, clipw, cliph)); [btn setimage:[uiimage imagewithcgimage:clipimg] forstate:uicontrolstatenormal]; //按钮选中状态图片 cgimageref clipselimg = cgimagecreatewithimageinrect(oriselimg.cgimage, cgrectmake(x, y, clipw, cliph)); [btn setimage:[uiimage imagewithcgimage:clipselimg] forstate:uicontrolstateselected]; [btn setbackgroundimage:[uiimage imagenamed:@"luckyrototeselected"] forstate:uicontrolstateselected]; btn.layer.anchorpoint = cgpointmake(0.5, 1); btn.layer.position = cgpointmake(self.bounds.size.width * 0.5, self.bounds.size.height * 0.5); btn.transform = cgaffinetransformmakerotation(angle2rad(angle)); angle += 30; [btn addtarget:self action:@selector(btnclick:) forcontrolevents:uicontroleventtouchupinside]; [self.contentv addsubview:btn]; //默认第一个按钮选中 if (i == 0) { [self btnclick:btn]; } }}- (void)btnclick:(uibutton *)btn { //1.让当前选中的按钮取消选中 self.selectbtn.selected = no; //2.让当前点击的按钮成为选中状态 btn.selected = yes; //3.当前点击的按钮成为选中状态 self.selectbtn = btn;}- (void)rotation { self.link.paused = no;}- (void)stop { self.link.paused = yes;}- (void)update { self.contentv.transform = cgaffinetransformrotate(self.contentv.transform, m_pi / 300.0);}- (ibaction)start:(id)sender { //快速转几圈 cabasicanimation *anim = [cabasicanimation animation]; anim.keypath = @"transform.rotation"; anim.tovalue = @(m_pi * 4); anim.duration = 0.5; anim.repeatcount = 1; anim.delegate = self; [self.contentv.layer addanimation:anim forkey:nil];}- (void)animationdidstop:(caanimation *)anim finished:(bool)flag { cgaffinetransform transform = self.selectbtn.transform; //获取当前选中按钮的旋转角度 cgfloat angle = atan2(transform.b, transform.a); //动画结束时当前选中的按钮指向最上方 self.contentv.transform = cgaffinetransformmakerotation(-angle);}@end |
wheelbtn.m
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//// wheelbtn.m// 转盘效果//// created by llkj on 2017/8/31.// copyright © 2017年 laynecheung. all rights reserved.//#import "wheelbtn.h"@implementation wheelbtn- (uiview *)hittest:(cgpoint)point withevent:(uievent *)event { cgrect rect = cgrectmake(0, 0, self.bounds.size.width, self.bounds.size.height * 0.5); if (cgrectcontainspoint(rect, point)) { // 在指定的范围内 return [super hittest:point withevent:event]; } else { return nil; }}//取消按钮高亮状态做的事- (void)sethighlighted:(bool)highlighted {}//返回当前按钮中的image位置和尺寸- (cgrect)imagerectforcontentrect:(cgrect)contentrect { return cgrectmake((contentrect.size.width - 40) *0.5, 20, 40, 48);}//返回当前按钮中的label位置和尺寸//- (cgrect)titlerectforcontentrect:(cgrect)contentrect{////}@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/u010981736/article/details/77747555
