我有一个关于我的应用程序的教程,它应该只在第一次打开应用程序时显示,并且应该点击以关闭。
我正在初始化一个UITapGestureRecognizer在我的视图DidLoad:
tapper_tut = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
tapper_tut.cancelsTouchesInView = FALSE;
[self.view addGestureRecognizer:tapper_tut];
我有一个 IBAction 来检测水龙头并将教程设置为隐藏:
- (IBAction)dismiss_tut{
if (????????????????) {
_tutorial.hidden = YES;
}
}
但是我不知道在 if 语句条件中加入什么,或者这是否是正确的方法。
如何在点击时关闭 UIImageView?
UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];
[self.view addGestureRecognizer:gr];
// if not using ARC, you should [gr release];
// mySensitiveRect coords are in the coordinate system of self.view
- (void)handleGesture:(UIGestureRecognizer *)gestureRecognizer {
CGPoint p = [gestureRecognizer locationInView:self.view];
if (CGRectContainsPoint(mySensitiveRect, p)) {
NSLog(@"got a tap in the region i care about");
} else {
NSLog(@"got a tap, but not where i need it");
}
}
你可以像这样制作 viewDidLoad
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
/* Create the Tap Gesture Recognizer */
self.tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(handleTaps:)];
/* The number of fingers that must be on the screen */
self.tapGestureRecognizer.numberOfTouchesRequired = 1;
/* The total number of taps to be performed before the gesture is recognized */
self.tapGestureRecognizer.numberOfTapsRequired = 1;
/* Add this gesture recognizer to the view */
[self.view addGestureRecognizer:self.tapGestureRecognizer];
}
要检测水龙头,您可以像这样制作方法。
- (void) handleTaps:(UITapGestureRecognizer*)paramSender
{
NSUInteger touchCounter = 0;
for (touchCounter = 0;touchCounter < paramSender.numberOfTouchesRequired;touchCounter++)
{
CGPoint touchPoint =[paramSender locationOfTouch:touchCounter inView:paramSender.view];
NSLog(@"Touch #%lu: %@",(unsigned long)touchCounter+1, NSStringFromCGPoint(touchPoint));
}
}
你必须将.h文件声明为"UIGestureRecognizerDelegate"
您可以按以下步骤以两种方式点击手势。
1) 调用手势识别器的委托方法(未给定操作)
UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:nil]; // not given action.
recognizer.numberOfTouchesRequired=1;// here how many tap you want set it
[self.view addGestureRecognizer:recognizer];
recognizer.delegate = self;
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
//whatever you want write code here
return NO;
}
2)给定的行动
UITapGestureRecognizer *oneTouch=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(Addphoto)];
[oneTouch setNumberOfTouchesRequired:1];
[self.view addGestureRecognizer:oneTouch];
-(IBAction)Addphoto
{
//whatever you want write code here
}
也许会有所帮助.
我认为您需要检测应用程序的首次启动,您可以通过以下方式进行操作
![[NSUserDefaults standardUserDefaults] boolForKey:@"HasLaunchedOnce"]
把它放在你的 if 语句中。