objective c 手动创建按钮并绑定事件处理程序

- (void)createButton
{
 
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
myButton.frame = CGRectMake(100, 100, 100, 50);
[myButton setTitle:@"click me!" forState:UIControlStateNormal];
SEL eventHandler = @selector(clickHandler);
[myButton addTarget:self action:eventHandler forControlEvents:UIControlEventTouchUpInside];
[window addSubview:myButton];
}
 
- (void)clickHandler
{
NSLog(@"You clicked button!");
}