抽屉效果

 1 #import <UIKit/UIKit.h>
 2 //实现抽屉效果
 3 //由于手机屏幕较小，内容较多,有效利用空间 。
 4 @interface RootViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
 5 {
 6     UITableView  *tv1;
 7     UITableView *tv2;
 8     CGPoint startPoint;
 9     CGPoint endPoint;
10 }
11 @end

 1 #import "RootViewController.h"
 2 
 3 @interface RootViewController ()
 4 
 5 @end
 6 
 7 @implementation RootViewController
 8 
 9 - (void)viewDidLoad {
10     [super viewDidLoad];
11     // Do any additional setup after loading the view.
12     [self createUI];
13 }
14 -(void)createUI{
15     tv1=[[UITableView alloc] initWithFrame:CGRectMake(0, 20, 375, 600) style:UITableViewStylePlain];
16     tv1.delegate=self;
17     tv1.dataSource=self;
18      tv1.tag=1;
19     [self.view addSubview:tv1];
20     tv2=[[UITableView alloc] initWithFrame:CGRectMake(0, 20, 375, 600) style:UITableViewStylePlain];
21     tv2.delegate=self;
22     tv2.dataSource=self;
23     tv2.tag=2;
24     [self.view addSubview:tv2];
25     
26     //使用拖拽手势(移动)实现抽屉效果
27     UIPanGestureRecognizer *pan=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan_View:)];
28     [self.view addGestureRecognizer:pan];
29 }
30 -(void)pan_View:(UIPanGestureRecognizer *)sender{
31     NSLog(@"你拖拽了视图");
32     //分析抽屉效果的原理：通过改变坐标来实现。(tv2在tv1上面移动)
33     //手势向右移动多少，上层视图的横坐标就向右移动多少
34     //先获得手势的坐标
35     CGPoint p=[sender locationInView:self.view];
36     //判断手势的状态是否是拖拽的开始
37     if (sender.state==UIGestureRecognizerStateBegan) {
38         //手势开始的坐标
39         startPoint=p;
40     }
41     
42     if (p.x>startPoint.x) {
43         if (tv2.frame.origin.x==250) {
44             return;
45         }else{
46             //tv2的x随着手势的x的变化而变化
47             tv2.frame=CGRectMake(p.x-startPoint.x, 20, 375, 600);
48         }
49     }else{
50         //判断tv2的x值如果tv2的x不为0,让tv2随手势的x值变化而变化
51         if (tv2.frame.origin.x!=0) {
52             tv2.frame=CGRectMake(250+p.x-startPoint.x, 20, 375, 600);
53             tv1.alpha=0.5;
54         }
55     }
56 
57     //判断手势的结束状态
58     if (sender.state==UIGestureRecognizerStateEnded) {
59         if (tv2.frame.origin.x>100) {
60             [UIView animateWithDuration:1 animations:^{
61                 tv2.frame=CGRectMake(250, 20, 375, 600);
62             }];
63         }else{
64             [UIView animateWithDuration:1 animations:^{
65                 //动画
66                 tv2.frame=CGRectMake(0, 20, 375, 600);
67             }];
68         }
69     }
70 }
71 -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
72     return 30;
73 }
74 -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
75     NSString *identifier=@"swipe";
76     UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:identifier];
77     if (cell==nil) {
78         cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
79     }
80     NSInteger i=tableView.tag;
81     if (i==1) {
82         cell.textLabel.text=[NSString stringWithFormat:@"geqhfjchckheqwf2jffk1%ld",indexPath.row];
83         cell.backgroundColor=[UIColor redColor];
84     }else{
85         cell.textLabel.text=[NSString stringWithFormat:@"hggrf e2jefwefekjf%c",‘A‘+(int)indexPath.row];
86         cell.backgroundColor=[UIColor grayColor];
87     }
88     return cell;
89 }