IOS：九宫格的实现及添加删除操作
先上结果图看下
一开始设置两个按钮，其实这两个按钮没必要用懒加载的方式，因为这是一开始就要用或者说常用的东西，直接写比较好。然后提示的label和图片信息的数组，都是该用到的时候才去加载。
图片我是事先改名1-9了，直接把名字循环存到数组里。然后创建ImageView的时候根据下标取值。
按钮的点击，会改变下标值。imageView的XY 值根据下标值算的,同时根据index设置自身的标记，删除imageView就是根据这个来。
imageview的tag，原来我是根据index来的，后来一删除就黑屏，感觉是把self.view移除了。看网上说是viewwithtag会查找自身，估计自身的tag和imageview的重了把。于是我把imageview的tag+10，这样就没问题了
1 static int arrindex=0;
2 @interface ViewController ()
3 @property(strong,nonatomic)UILabel *itemlabel;
4 @property(strong,nonatomic) UIButton *addBtn;
5 @property(strong,nonatomic) UIButton *removeBtn;
6 @property(strong,nonatomic)NSMutableArray<UIImage *> *imageArr;
7 @property(strong,nonatomic)UIImageView *imageView;
8 @end
9
10 @implementation ViewController
11
12 - (void)viewDidLoad {
13 [super viewDidLoad];
14 // Do any additional setup after loading the view.
15 [self setBaseUI];
16 // self.view.backgroundColor=[UIColor redColor];
17
18 }
19 -(UIButton *)addBtn{
20 if(!_addBtn){
21 _addBtn=[UIButton buttonWithType:UIButtonTypeCustom];
22 _addBtn.frame=CGRectMake(50, 200, 100,40 );
23 _addBtn.backgroundColor=[UIColor grayColor];
24 [_addBtn setTitle:@"添加" forState:UIControlStateNormal];
25 [_addBtn setTitle:@"添加" forState:UIControlStateHighlighted];
26 [ _addBtn addTarget:self action:@selector(btn1Click) forControlEvents:UIControlEventTouchUpInside];
27 [_addBtn setTag:1];
28 [self.view addSubview:_addBtn];
29 }
30 return _addBtn;
31
32 }
33 -(UIButton *)removeBtn{
34 if(!_removeBtn){
35 _removeBtn=[UIButton buttonWithType:UIButtonTypeCustom];
36 _removeBtn.frame=CGRectMake(self.view.bounds.size.width-50-100, 200, 100,40 );
37 _removeBtn.backgroundColor=[UIColor grayColor];
38 [_removeBtn setTitle:@"删除" forState:UIControlStateNormal];
39 [_removeBtn setTitle:@"删除" forState:UIControlStateHighlighted];
40 [ _removeBtn addTarget:self action:@selector(btn2Click) forControlEvents:UIControlEventTouchUpInside];
41 [_removeBtn setTag:2];
42 [self.view addSubview:_removeBtn];
43 }
44 return _removeBtn;
45
46 }
47
48 -(UILabel *)itemlabel{
49 if(!_itemlabel)
50 {
51 _itemlabel=[[UILabel alloc]initWithFrame:CGRectMake(170, 150, 200, 40) ];
52 _itemlabel.textColor=[UIColor redColor];
53 [self.view addSubview:_itemlabel];
54 }
55 return _itemlabel;
56
57 }
58 -(void)setBaseUI{
59 [self addBtn];
60 [self removeBtn];
61 }
62
63 -(void)btn1Click{
64 NSLog(@"点击了添加按钮");
65 if(arrindex==9)
66 {
67 NSLog(@"图片已结束");
68 self.itemlabel.text=@"图片已结束";
69 return;
70 }
71 self.itemlabel.text=@"";
72 [self setXY:arrindex:_addBtn];
73 arrindex=arrindex+1;
74 }
75 -(void)btn2Click{
76 NSLog(@"点击了删除按钮");
77 if(arrindex==0)
78 {
79 NSLog(@"暂无图片");
80 self.itemlabel.text=@"暂无图片";
81 return;
82 }
83 self.itemlabel.text=@"";
84 [self setXY:arrindex:_removeBtn];
85 arrindex=arrindex-1;
86 }
87 //将图片存入数组
88 -(NSMutableArray<UIImage *> *)imageArr{
89 //将事先的图片信息存入数组里
90 if(!_imageArr)
91 {
92 _imageArr=[NSMutableArray array];
93 for(int i=0;i<9;i++)
94 {
95 NSString *imageName=[NSString stringWithFormat:@"%d",i+1];
96 UIImage *image=[UIImage imageNamed:imageName];
97 [_imageArr addObject:image];
98 }
99 }
100 return _imageArr;
101 }
102
103 //UIImageView的设定
104 -(void)imageView:(CGFloat )locx:(CGFloat)locY:(int )index{
105 CGFloat x=locx;
106 CGFloat y=locY;
107 //传入图片的下标值
108 int arrindex=index;
109 //坐标传入决定
110 _imageView=[[UIImageView alloc]initWithFrame:CGRectMake(x, y, 100, 100)];
111 _imageView.image= [self.imageArr objectAtIndex:arrindex];
112 /*设置imageview的tag，以便后续的删除，删除肯定是要根据标记来。
113 还有种是self.view.subviews lastobject,但是因为我加了一个label,所以用这个肯定是不太合适的。
114 */
115 _imageView.tag=arrindex+10;
116 _imageView.backgroundColor=[UIColor redColor];
117 [self.view addSubview:_imageView];
118
119 }
120
121 -(void)setXY:(int )index:(UIButton *)button{
122 if(button.tag==1)
123 {
124 CGFloat viewW=self.view.bounds.size.width;
125 int row=index/3;
126 int col=index%3;
127 /*假如我们设定每个UIimageView的大小是100*100
128 每行之间的距离为30。第一行从Y-250的位置开始
129 */
130 CGFloat space=(viewW-300)/2;
131
132 CGFloat x=col*(space+100);
133 CGFloat y=250+row*(30+100);
134 [self imageView:x:y:index];
135 }
136 if(button.tag==2)
137 {
138 UIImageView *imageview=[self.view viewWithTag:index-1+10 ];
139 [imageview removeFromSuperview];
140 }
141 }
142
143 @end
