02-动态创建按钮

 1 // 这是控制器的一个方法：当控制器的view创建完毕的时候调用一次
 2 - (void)viewDidLoad {
 3     [super viewDidLoad];
 4     // Do any additional setup after loading the view, typically from a nib.
 5     
 6     // 1.创建按钮
 7     // 1.1创建
 8     UIButton *btn = [[UIButton alloc] init];
 9     NSLog(@"btn -- %p", btn);
10     
11     // 1.2设置按钮的尺寸和位置
12     btn.frame = CGRectMake(0, 0, 100, 100);
13     
14     // 1.3设置按钮普通状态下的属性
15     // 1.3.1设置背景图片
16     UIImage *normal = [UIImage imageNamed:@"btn_01.png"];
17     [btn setBackgroundImage:normal forState:UIControlStateNormal];
18     
19     // 1.3.2设置文字
20     [btn setTitle:@"点我咯" forState:UIControlStateNormal];
21     
22     // 1.3.3设置文字颜色
23     [btn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
24     
25     // 1.4设置按钮高亮状态下的属性
26     // 1.4.1设置背景图片
27     UIImage *high = [UIImage imageNamed:@"btn_02.png"];
28     [btn setBackgroundImage:high forState:UIControlStateHighlighted];
29     
30     // 1.4.2设置文字
31     [btn setTitle:@"摸我干啥" forState:UIControlStateHighlighted];
32     
33     // 1.4.3设置文字颜色
34     [btn setTitleColor:[UIColor greenColor] forState:UIControlStateHighlighted];
35     
36     // 1.5监听按钮点击
37     [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
38     
39     // 1.6增加到view中
40     [self.view addSubview:btn];
41     
42     UITextField *txt = [[UITextField alloc] init];
43     txt.frame = CGRectMake(100, 100, 100, 50);
44     CGFloat centerX = self.view.frame.size.width*0.5;
45     CGFloat centerY = self.view.frame.size.height*0.5;
46     txt.center = CGPointMake(centerX, centerY);
47     txt.backgroundColor = [UIColor redColor];
48     [txt setText:@"默认文本值"];
49     [txt setFont:[UIFont boldSystemFontOfSize:20]];
50     
51     [self.view addSubview:txt];
52 }
53 
54 - (void)didReceiveMemoryWarning {
55     [super didReceiveMemoryWarning];
56     // Dispose of any resources that can be recreated.
57 }
58 
59 - (void)btnClick:(UIButton *)btn
60 {
61     NSLog(@"btnClick -- %p", btn);
62  
63 }