在我的 iOS 应用程序中,当按下按钮时会启动一个事件,并在屏幕底部显示一条状态消息,通知用户操作成功或失败。
状态消息出现和消失,代码如下。
这个显示消息
- (void) showMessage:(NSString*)text
{
CGRect frame = [[self view] frame];
if(statusView == nil)
{
messageViewWindow = [[UIWindow alloc] initWithFrame:CGRectMake(0, frame.size.height-29,
frame.size.width, 0)];
statusView = [[StatusMessageView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, 0)
Text:text
andShowIndicator:NO];
[messageViewWindow addSubview:statusView];
[messageViewWindow makeKeyAndVisible];
}
UILabel *label = [statusView getTextLabel];
UIImageView *imageView = [statusView getBackImageView];
CGSize stringSize = [text sizeWithFont:[Constants getLabelFont]];
int xCoordinate = (messageViewWindow.frame.size.width - stringSize.width)/2;
[UIView beginAnimations:nil context:nil];
messageViewWindow.frame = CGRectMake(0, frame.size.height-59, frame.size.width, 30);
statusView.frame = CGRectMake(0, 0, frame.size.width, 30);
label.frame = CGRectMake(xCoordinate,5,stringSize.width,20);
imageView.frame = CGRectMake(0, 0, frame.size.width, 30);
[UIView commitAnimations];
[NSTimer scheduledTimerWithTimeInterval:2.0f target:self selector:@selector(hideMessage) userInfo:nil repeats:NO];
}
这个隐藏了消息
- (void) hideMessage
{
UILabel *label = [statusView getTextLabel];
UIImageView *imageView = [statusView getBackImageView];
CGRect labelFrame = label.frame;
[UIView beginAnimations:nil context:nil];
messageViewWindow.frame = CGRectMake(0, [UIScreen mainScreen].applicationFrame.size.height-29, [UIScreen mainScreen].applicationFrame.size.width, 0);
statusView.frame = CGRectMake(0, 0, [UIScreen mainScreen].applicationFrame.size.width, 0);
label.frame = CGRectMake(labelFrame.origin.x, 0, labelFrame.origin.y, 0);
imageView.frame = CGRectMake(0, 0, [UIScreen mainScreen].applicationFrame.size.width, 0);
[UIView commitAnimations];
}
奇怪的是,消息显示并在两秒钟后消失,但是主窗口失去了功能,例如复制和粘贴功能。
你觉得我的方法有问题吗?有什么方法可以调用“动画”代码吗?