如何显示一系列突出显示的按钮?

可能有一种方法可以通过核心动画实现这一点,但这不是必需的。您没有设置高亮显示属性的动画,您只是打开和关闭它。

我创建了一个简单的基于视图的iPhone应用程序,用定时器来实现这一点。以下是来自视图控制器的代码:

SimonTestViewController.h :

#import <UIKit/UIKit.h>

@interface SimonTestViewController : UIViewController {
 IBOutlet UIButton *redButton;
 IBOutlet UIButton *blueButton;
 IBOutlet UIButton *greenButton;
 IBOutlet UIButton *yellowButton;
}

- (void)highlightButton:(UIButton*)button Delay:(double)delay;
- (void)highlightOn:(NSTimer*)timer;
- (void)highlightOff:(NSTimer*)timer;

@end

SimonTestViewController.m :

#import "SimonTestViewController.h"

@implementation SimonTestViewController

const double HIGHLIGHT_SECONDS = 0.5; // 500 ms
const double NEXT_SECONDS = 0.6; // 600 ms

- (void)viewDidAppear:(BOOL)animated {
 [super viewDidAppear:animated];

 [self highlightButton:redButton Delay:0.0];
 [self highlightButton:blueButton Delay:NEXT_SECONDS];
 [self highlightButton:greenButton Delay:NEXT_SECONDS * 2];
 [self highlightButton:blueButton Delay:NEXT_SECONDS * 3];
 [self highlightButton:yellowButton Delay:NEXT_SECONDS * 4];
 [self highlightButton:redButton Delay:NEXT_SECONDS * 5];
}

- (void)highlightButton:(UIButton*)button Delay:(double)delay {
 [NSTimer scheduledTimerWithTimeInterval:delay target:self selector:@selector(highlightOn:) userInfo:button repeats:NO];
}

- (void)highlightOn:(NSTimer*)timer {
 UIButton *button = (UIButton*)[timer userInfo];

 button.highlighted = YES;

 [NSTimer scheduledTimerWithTimeInterval:HIGHLIGHT_SECONDS target:self selector:@selector(highlightOff:) userInfo:button repeats:NO];
}

- (void)highlightOff:(NSTimer*)timer {
 UIButton *button = (UIButton*)[timer userInfo];

 button.highlighted = NO;
}