IOS UI-Button按钮

 1 #import "ViewController.h"
 2 
 3 @interface ViewController ()
 4 {
 5     UILabel *lable;
 6     BOOL moveFlag;
 7     NSInteger length;
 8     UIButton *btn;
 9     NSTimer *timer;
10 }
11 
12 @end
13 
14 @implementation ViewController
15 
16 - (void)viewDidLoad {
17     [super viewDidLoad];
18     moveFlag = NO;
19     length = 10;
20     
21     self.view.backgroundColor = [UIColor darkGrayColor];
22     lable = [[UILabel alloc] init];
23     lable.frame = CGRectMake(50, 100, 280, 50);
24     lable.text = @"点我啊";
25     lable.backgroundColor = [UIColor whiteColor];
26     [self.view addSubview:lable];
27     
28     // 按钮UIButton
29     btn = [UIButton buttonWithType:UIButtonTypeCustom];
30     // 设置按钮坐标、大小
31     btn.frame = CGRectMake(170, 250, 50, 50);
32     // 设置背景图
33     [btn setImage:[UIImage imageNamed:@"fire_down.png"] forState:UIControlStateNormal];
34     [btn setImage:[UIImage imageNamed:@"blue_down.png"] forState:UIControlStateHighlighted];
35 
36     
37     // 设置标题(状态标题)
38 //    [btn setTitle:@"开始" forState:UIControlStateNormal];
39 //    [btn setTitle:@"按下" forState:UIControlStateHighlighted];
40     
41     // 给按钮添加 [关联事件]
42     [btn addTarget:self action:@selector(touchMe) forControlEvents:UIControlEventTouchUpInside];
43     // 添加背景色
44     [btn setBackgroundColor:[UIColor cyanColor]];
45     
46     // 按钮变圆
47     btn.layer.cornerRadius = 20;
48     // 添加按钮到视图上
49     [self.view addSubview:btn];
50 
51 }
52 
53 -(void) touchMe
54 {
55     //判断完了小球动没有动
56     if (moveFlag ==NO) {
57         moveFlag = YES;
58     }
59     else
60         moveFlag = NO;
61     
62     //当小球没有动得时候，点小球-变动
63     if (moveFlag) {
64         timer = [NSTimer timerWithTimeInterval:0.1 target:self selector:@selector(bollMove) userInfo:nil repeats:YES];
65         [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
66     }
67     else
68         [timer invalidate];
69     //当小球动得时候，点小球-不动
70     
71 }
72 
73 -(void) bollMove
74 {
75     
76     if (btn.frame.origin.y>600) {
77         length = -10;
78 
79     }
80     else if (btn.frame.origin.y<0)
81     {
82         length = 10;
83     }
84     
85     CGRect rect = btn.frame;
86     rect.origin.y += length;
87     btn.frame = rect;
88 
89 }