iOS开发——UI基础-按钮的创建和设置

 @interface ViewController ()
 - (IBAction)customBtnClick;

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.

     UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

     // 1.设置标题
 //    btn.titleLabel.text = @"我是按钮"; // 千万不要这样写
     // 一般情况下给按钮设置内容都是setXXX
     [btn setTitle:@"我是按钮" forState:UIControlStateNormal];
     [btn setTitle:@"哥是高亮" forState:UIControlStateHighlighted];

     // 2.设置标题颜色
 //    btn.backgroundColor = [UIColor redColor];
     [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

     // 3.设置图标
     [btn setImage:[UIImage imageNamed:@"common_icon_check"] forState:UIControlStateNormal];

     // 4.设置背景图片
     [btn setBackgroundImage:[UIImage imageNamed:@"common_button_big_blue_highlighted"] forState:UIControlStateNormal];

     // 5.监听按钮的点击
     // Target:让谁监听按钮
     // action:监听到之后需要执行的方法
     // Events:事件的类型
     // 规律: 只要是继承于UIControl的控件, 都可以通过addTarget来添加监听
     [btn addTarget:self action:@selector(customBtnClick) forControlEvents:UIControlEventTouchUpInside];

 //    UISwitch sw = nil;
 //    [sw addTarget:<#(nullable id)#> action:<#(nonnull SEL)#> forControlEvents:<#(UIControlEvents)#>]

 //    UISegmentedControl *sc = nil;
 //    [sc addTarget:<#(nullable id)#> action:<#(nonnull SEL)#> forControlEvents:<#(UIControlEvents)#>]

 //    UITextField *tf = nil;
 //    [tf addTarget:<#(nullable id)#> action:<#(nonnull SEL)#> forControlEvents:<#(UIControlEvents)#>]

     btn.titleLabel.font = [UIFont systemFontOfSize:];
     btn.frame = CGRectMake(, , , );
     [self.view addSubview:btn];
 }

 - (IBAction)customBtnClick {
     NSLog(@"%s", __func__);
 }
 @end