按钮的创建和设置

 1 @interface ViewController ()
 2 - (IBAction)customBtnClick;
 3 
 4 @end
 5 
 6 @implementation ViewController
 7 
 8 - (void)viewDidLoad {
 9     [super viewDidLoad];
10     // Do any additional setup after loading the view, typically from a nib.
11     
12     UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
13     
14     // 1.设置标题
15 //    btn.titleLabel.text = @"我是按钮"; // 千万不要这样写
16     // 一般情况下给按钮设置内容都是setXXX
17     [btn setTitle:@"我是按钮" forState:UIControlStateNormal];
18     [btn setTitle:@"哥是高亮" forState:UIControlStateHighlighted];
19     
20     // 2.设置标题颜色
21 //    btn.backgroundColor = [UIColor redColor];
22     [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
23     
24     // 3.设置图标
25     [btn setImage:[UIImage imageNamed:@"common_icon_check"] forState:UIControlStateNormal];
26     
27     // 4.设置背景图片
28     [btn setBackgroundImage:[UIImage imageNamed:@"common_button_big_blue_highlighted"] forState:UIControlStateNormal];
29     
30     // 5.监听按钮的点击
31     // Target:让谁监听按钮
32     // action:监听到之后需要执行的方法
33     // Events:事件的类型
34     // 规律: 只要是继承于UIControl的控件, 都可以通过addTarget来添加监听
35     [btn addTarget:self action:@selector(customBtnClick) forControlEvents:UIControlEventTouchUpInside];
36     
37 //    UISwitch sw = nil;
38 //    [sw addTarget:<#(nullable id)#> action:<#(nonnull SEL)#> forControlEvents:<#(UIControlEvents)#>]
39     
40 //    UISegmentedControl *sc = nil;
41 //    [sc addTarget:<#(nullable id)#> action:<#(nonnull SEL)#> forControlEvents:<#(UIControlEvents)#>]
42     
43 //    UITextField *tf = nil;
44 //    [tf addTarget:<#(nullable id)#> action:<#(nonnull SEL)#> forControlEvents:<#(UIControlEvents)#>]
45     
46     btn.titleLabel.font = [UIFont systemFontOfSize:14];
47     btn.frame = CGRectMake(100, 100, 100, 100);
48     [self.view addSubview:btn];
49 }
50 
51 - (IBAction)customBtnClick {
52     NSLog(@"%s", __func__);
53 }
54 @end