为BarButton创建推送动画

Question

在视图控制器上，我有一个带有自定义图像的后退按钮

UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 32, 32)];
[backButton setImage:[UIImage imageNamed:@"left207.png"] forState:UIControlStateNormal];
[backButton addTarget:self action:@selector(goToParent) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *backBtn = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = backBtn;
self.navigationItem.rightBarButtonItem = rightButton;

但是当我运行应用程序时，没有任何推动效果。它不会变暗一秒钟。

Answer 1

您需要为突出显示的状态设置另一个图像：

[backButton setImage:[UIImage imageNamed:@"highlightedButton"] forState:UIControlStateHighlighted];