服务器之家

服务器之家 > 正文

Objective-C实现无限循环轮播器

时间:2021-01-19 15:29     来源/作者:zhangmi

先看看效果图:

Objective-C实现无限循环轮播器

具体实现代码:

1. 控制器    

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
//
// appdelegate.m
// 无限轮播器
//
// created by zhangmi on 16/5/16.
// copyright © 2016年 paramount pictures. all rights reserved.
//
#import "viewcontroller.h"
#import "sninfinitescrollview.h"
 
@interface viewcontroller ()
 
@end
 
@implementation viewcontroller
 
- (void)viewdidload {
 [super viewdidload];
 // do any additional setup after loading the view, typically from a nib.
  
 nsmutablearray * images = [nsmutablearray array];
 for (int i = 0; i < 5; i++) {
  nsstring * imagename = [nsstring stringwithformat:@"ad_%02d", i]; //img01
  uiimage * image = [uiimage imagenamed:imagename];
  [images addobject:image];
 }
 uiview * scrollview = [sninfinitescrollview scrollviewwithframe:cgrectmake(0, 20, 414, 200) superview:self.view images:images scrolldirection:scrolldirectionhorizontal pageindicatortintcolor:[uicolor lightgraycolor] currentpageindicatortintcolor:[uicolor orangecolor] imageviewcontentmode:uiviewcontentmodescaleaspectfit];
  
 [self.view addsubview:scrollview];
}
 
@end

2. 显示内容界面设置

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
//
// appdelegate.m
// 无限轮播器
//
// created by zhangmi on 16/5/16.
// copyright © 2016年 paramount pictures. all rights reserved.
//
 
#import "sninfinitescrollview.h"
 
static int const imageviewcount = 3;
#define scrollviewwidth self.scrollview.frame.size.width
#define scrollviewheight self.scrollview.frame.size.height
 
@interface sninfinitescrollview () <uiscrollviewdelegate>
 
@property(weak, nonatomic) uiscrollview * scrollview;
@property(weak, nonatomic) nstimer * timer;
/** pageindex */
@property(nonatomic, assign) nsinteger pageindex;
 
@end
 
@implementation sninfinitescrollview
 
- (void)setimages:(nsarray<uiimage *> *)images {
  
 _images = images;
  
 // 设置页码
 self.pageindex = 0;
  
 // 设置内容
 [self updatecontent];
  
 // 开始定时器
 [self starttimer];
}
 
/** 代码创建的时候调用. */
- (instancetype)initwithframe:(cgrect)frame {
 if (self = [super initwithframe:frame]) {
  // 滚动视图
  uiscrollview * scrollview = [[uiscrollview alloc] init];
   
  self.scrollview = scrollview;
  scrollview.delegate = self;
  // scroller属性
  scrollview.showshorizontalscrollindicator = no;
  scrollview.showsverticalscrollindicator = no;
  scrollview.pagingenabled = yes;
  scrollview.bounces = no;
  // 添加scrollview
  [self addsubview:scrollview];
   
  // 图片控件
  for (int i = 0; i < imageviewcount; i++) {
   uiimageview * imageview = [[uiimageview alloc] init];
   // 图片不变形处理.
   imageview.contentmode = self.imageviewcontentmode;
   [scrollview addsubview:imageview];
  }
 }
 return self;
}
/** 布局 子控件, 只执行一次 */
- (void)layoutsubviews {
 [super layoutsubviews];
  
 self.scrollview.frame = self.bounds;
 if (self.scrolldirection == scrolldirectionvertical) {
  self.scrollview.contentsize = cgsizemake(0, imageviewcount * self.bounds.size.height);
 } else {
  self.scrollview.contentsize = cgsizemake(imageviewcount * self.bounds.size.width, 0);
 }
  
 for (int i = 0; i < imageviewcount; i++) {
  uiimageview * imageview = self.scrollview.subviews[i];
   
  if (self.scrolldirection == scrolldirectionvertical) {
   imageview.frame = cgrectmake(0, i * self.scrollview.frame.size.height, self.scrollview.frame.size.width, self.scrollview.frame.size.height);
  } else {
   imageview.frame = cgrectmake(i * self.scrollview.frame.size.width, 0, self.scrollview.frame.size.width, self.scrollview.frame.size.height);
  }
 }
 // 设置内容
 [self updatecontent];
}
#pragma mark - 内容更新
- (void)updatecontent {
 // 设置图片
 for (int i = 0; i < self.scrollview.subviews.count; i++) {
   
  nsinteger pageindex = self.pageindex;
  // 遍历每一个imageview
  uiimageview * imageview = self.scrollview.subviews[i];
   
  if (i == 0) {
   pageindex--;
  } else if (i == 2) {
   pageindex++;
  }
   
  if (pageindex < 0) {
   pageindex = self.images.count - 1;
  } else if (pageindex >= self.images.count) {
   pageindex = 0;
  }
  // 图片角标 赋值给 imageview的tag
  imageview.tag = pageindex;
  imageview.image = self.images[imageview.tag];
 }
  
 // 设置偏移量在中间 // 不能使用带动画 contentoffset
 if (self.scrolldirection == scrolldirectionvertical) {
  self.scrollview.contentoffset = cgpointmake(0, scrollviewheight);
 } else {
  self.scrollview.contentoffset = cgpointmake(scrollviewwidth, 0);
 }
}
#pragma mark - <uiscrollviewdelegate>
- (void)scrollviewdidscroll:(uiscrollview *)scrollview {
 // 找出最中间的那个图片控件
 nsinteger page = self.pageindex;
 cgpoint point = cgpointzero;
 for (int i = 0; i < self.scrollview.subviews.count; i++) {
  uiimageview * imageview = self.scrollview.subviews[i];
  point = [scrollview convertpoint:imageview.frame.origin toview:self.superview];
  //=****** other way ****************** stone ***
  if (self.scrolldirection == scrolldirectionvertical) {
   if (abs(point.y - self.frame.origin.y) < 1.0) {
    page = imageview.tag;
   }
  } else {
   if (abs(point.x - self.frame.origin.x) < 1.0) {
    page = imageview.tag;
   }
  }
 }
 self.pageindex = page;
 self.pagecontrol.currentpage = page;
  
 //拖动结束会调用 [self updatecontent];
 //#warning mark - 没有动画正常 , 有动画不动, 一直是原点
 // [self updatecontent]; // 没有动画正常 , 有动画不动, 一直是原点
}
/** 开始拖拽 */
- (void)scrollviewwillbegindragging:(uiscrollview *)scrollview {
 // 停止定时器
 [self stoptimer];
}
/** 结束拖拽 */
- (void)scrollviewdidenddragging:(uiscrollview *)scrollview willdecelerate:(bool)decelerate {
 // 开启定时器
 [self starttimer];
}
/** 减速完毕 */
- (void)scrollviewdidenddecelerating:(uiscrollview *)scrollview {
 // 更新内容 , 如果contentoffset 不带动画的话 不走这个方法
 [self updatecontent];
}
/** 结束滚动动画 */ // 这是保险的做法吧... 如果contentoffset 不带动画的话 不走这个方法
- (void)scrollviewdidendscrollinganimation:(uiscrollview *)scrollview {
 // 更新内容
 [self updatecontent];
}
 
#pragma mark - 定时器处理
- (void)starttimer {
  
 nstimer * timer = [nstimer scheduledtimerwithtimeinterval:1.0 target:self selector:@selector(next:) userinfo:nil repeats:yes];
 // [[nsrunloop mainrunloop] addtimer:timer formode:nsrunloopcommonmodes];
 [[nsrunloop currentrunloop] addtimer:timer formode:nsrunloopcommonmodes];
 self.timer = timer;
}
 
- (void)stoptimer {
 [self.timer invalidate];
 self.timer = nil;
}
 
- (void)next:(nstimer *)timer {
 if (self.scrolldirection == scrolldirectionvertical) {
  [self.scrollview setcontentoffset:cgpointmake(0, 2 * self.scrollview.frame.size.height) animated:yes];
 } else {
  [self.scrollview setcontentoffset:cgpointmake(2 * self.scrollview.frame.size.width, 0) animated:yes];
 }
}
//=****** 简单调用 ****************** stone ***
+ (instancetype)scrollviewwithframe:(cgrect)frame superview:(uiview *)superview images:(nsarray<uiimage *> *)images scrolldirection:(scrolldirection)scrolldirection pageindicatortintcolor:(uicolor *)pageindicatortintcolor currentpageindicatortintcolor:(uicolor *)currentpageindicatortintcolor imageviewcontentmode:(uiviewcontentmode)imageviewcontentmode {
  
 //=****** 添加自定义scrollview ****************** stone ***
 sninfinitescrollview * scrollview = [[sninfinitescrollview alloc] init];
 scrollview.frame = frame;
 scrollview.imageviewcontentmode = imageviewcontentmode;
 scrollview.scrolldirection = scrolldirection;
 //=****** 添加image ****************** stone ***
 scrollview.images = images;
 //=****** 添加pagecontrol ****************** stone ***
 uipagecontrol * pagecontrol = [[uipagecontrol alloc] init];
 scrollview.pagecontrol = pagecontrol;
 pagecontrol.enabled = no;
 pagecontrol.currentpageindicatortintcolor = currentpageindicatortintcolor;
 pagecontrol.pageindicatortintcolor = pageindicatortintcolor;
 pagecontrol.numberofpages = scrollview.images.count;
 pagecontrol.bounds = cgrectmake(0, 0, scrollview.bounds.size.width, 44);
 pagecontrol.center = cgpointmake(scrollview.bounds.size.width * 0.5, scrollview.bounds.size.height * 0.9);
 [scrollview addsubview:pagecontrol];
 [superview addsubview:scrollview];
 //=************************ stone ***
 return scrollview;
}
 
@end

以上就是本文的全部内容,希望对大家的学习有所帮助。

相关文章

热门资讯

2020微信伤感网名听哭了 让对方看到心疼的伤感网名大全
2020微信伤感网名听哭了 让对方看到心疼的伤感网名大全 2019-12-26
Intellij idea2020永久破解,亲测可用!!!
Intellij idea2020永久破解,亲测可用!!! 2020-07-29
背刺什么意思 网络词语背刺是什么梗
背刺什么意思 网络词语背刺是什么梗 2020-05-22
苹果12mini价格表官网报价 iPhone12mini全版本价格汇总
苹果12mini价格表官网报价 iPhone12mini全版本价格汇总 2020-11-13
歪歪漫画vip账号共享2020_yy漫画免费账号密码共享
歪歪漫画vip账号共享2020_yy漫画免费账号密码共享 2020-04-07
返回顶部