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
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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
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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
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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快网idc。
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