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:14];
    btn.frame = CGRectMake(100, 100, 100, 100);
    [self.view addSubview:btn];
}

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