I'm trying to make a screenshot capture App. The App will first place a semitransparent full screen dark view over other Apps, this will make other Apps not responding to mouse scrolling event. How can I set a view covers other Apps and keep them respond to scrolling event? Thanks.
Ignore MyApp's dark view?
or
Send event to other Apps in MyApp?
-(void)scrollWheel:(NSEvent *)theEvent {
NSLog(#"user scrolled %f horizontally and %f vertically", [theEvent deltaX], [theEvent deltaY]);
}
Edited:
Found a way to get a App's pid and Followed #Willeke's reference, write the following code, but not work.
-(void)scrollWheel:(NSEvent *)theEvent {
[super scrollWheel:theEvent];
CGEventRef wheelevent = CGEventCreateScrollWheelEvent(NULL, kCGScrollEventUnitLine, 1, theEvent.deltaY, theEvent.deltaX);
// AppPid is gotten before mouse wheel scrolls
CGEventPostToPid(AppPid, wheelevent);
CFRelease(wheelevent);
}
Related
I'm using Xcode 5 and the iOS7 SDK to build my app. I am wanting to make a sign in page very similar to that of the iOS7 eBay app.
So what I would like to do is this:
When the ViewController loads, I would like two UIButtons just above the keyboard
Once the user has finished entering their information and hitting the done button - the keyboard disappears and background animates very slightly to show a logo at the top.
I'm thinking I should be listening for UIKeyboard notifications and then do things based on that.
Here are my questions:
I am sure I can change the background image, based on the UIKeyboard notification status - how do I make it animate ? I don't want it to just appear?
How do I position the UIButtons correctly to sit by the keyboard ?
You should use the UIToolBar and set it as inputaccessoryview to the textFields.
Here is one clean & clear solution for this problem.
Blog Post here
For backGround animation please use this.
May be you can set the background logo alpha = 0 initially.
[UIView animateWithDuration:0.7 animations:^{
self.view.logoImage.alpha = 1;
// make some more movements for anything that suits to your need.
// set frame of your textFields & any thing else that you need.
}
completion:^(BOOL finished){
// may be you can load a new view controller here.
}];
Hope that helps.
I have a (vertical) UISlider inside a UIScrollview. I'd like to be able to change the value of the slider, and, without lifting my finger, scroll the scrollview left or right.
Desired behavior:
Touch down inside vertical UISlider, followed by a finger drag left or right causes the scrollview to scroll
Actual behavior:
Touch down inside vertical UISlider, followed by a finger drag left or right causes no movement in UIScrollview. A touch down outside the UISlider followed by a drag will scroll the scrollview as expected
UIView has a property called exclusiveTouch which seems as if it might be related to my problem. I tried setting it to NO, with no luck.
So, how can is set up my UISliders so that the scrollview beneath them will respond to touches which originate inside the UISliders?
Have you tried subclassing UIScrollView and implementing - (BOOL)touchesShouldCancelInContentView:(UIView *)view? According to the Apple documentation:
// called before scrolling begins if touches have already been delivered to a subview of the scroll view. if it returns NO the touches will continue to be delivered to the subview and scrolling will not occur
// not called if canCancelContentTouches is NO. default returns YES if view isn't a UIControl
If you simply return NO if the view is your UISlider, this may do what you want, assuming your UIScrollView only scrolls horizontally. If this doesn't work, you likely will have to do custom touch handling (ie. overriding touchesBegan:withEvent:, touchesChanged:withEvent:, etc.) for both your UIScrollView and your UISlider.
What you are seeing is the intended behavior.
Each touch event only gets handled by one control. What exclusiveTouch does is actually to prevent other touch events from being delivered to other views.
To do what are trying to do you would have to do some of the touch handling yourself. Passing the event to both your views. You could do either do it by implementing all the touchesBegan:, touchesMoved: etc. methods and pass the events to both views. You can read more about that approach in the UIResponder documentation. Another approach is to do the event handling in a UIGestureRecognizer on the scroll view that hit tests the slider and updates the value of the slider using the y-delta. You can read more about gesture recognizers and event handling in the section about Gesture Recognizers in the Event Handling Guide for iOS.
Side note:
Go to the Settings app and toggle a switch half way (for example the Airplane mode toggle) and then drag down. Nothing will happen. The rest of the OS behaves the same way. Are you sure that this is the interaction that you really want to do? Apps that behave differently often feel weird and unfamiliar.
Your question confused me a bit. You are saying a vertical slider - but dragging left and right?
If you wish to scroll the scrollview when dragging the UISlider, the proper way to do so is
[mySlider addTarget:self action:#selector(sliderMoved:) forControlEvents:UIControlEventValueChanged];
and
- (void) sliderMoved:(UISlider*) slider {
myScrollView.contentOffset.x = slider.value * (myScrollView.contentSize.width - myScrollView.bounds.size.width);
}
Hope this is what you want.
You need to set delaysContentTouches as NO and prevent for UISlider objects to scroll, Check below code.
mySlider.delaysContentTouches = NO;
- (BOOL)touchesShouldBegin:(NSSet *)touches withEvent:(UIEvent *)event inContentView:(UIView *)view {
if ([view isKindOfClass:[UISlider class]])
{
UITouch *touchEvent = [[event allTouches] anyObject];
CGPoint locationEvent = [touchEvent locationInView:view];
CGRect thumbRect;
UISlider *mySlide = (UISlider*) view;
CGRect trackRect = [mySlide trackRectForBounds:mySlide.bounds];
thumbRect = [mySlide thumbRectForBounds:mySlide.bounds trackRect:trackRect value:mySlide.value];
if (CGRectContainsPoint(thumbRect, locationEvent))
return YES;
}
return NO;
}
I think you can get some reference from this example in this example it is shown that how to cancel any touch or any gesture recognizers and apply them to other views.
May this lead you to the solution of your problem and if it will just let me know about it
Happy Codding :)
I am trying to add a UIButton to the view of a MPMoviePlayerController along with the standard controls. The button appears over the video and works as expected receiving touch events, but I would like to have it fade in and out with the standard controls in response to user touches.
I know I could accomplish this by rolling my own custom player controls, but it seems silly since I am just trying to add one button.
EDIT
If you recursively traverse the view hierarchy of the MPMoviePlayerController's view eventually you will come to a view class called MPInlineVideoOverlay. You can add any additional controls easily to this view to achieve the auto fade in/out behavior.
There are a few gotchas though, it can sometimes take awhile (up to a second in my experience) after you have created the MPMoviePlayerController and added it to a view before it has initialized fully and created it's MPInlineVideoOverlay layer. Because of this I had to create an instance variable called controlView in the code below because sometimes it doesn't exist when this code runs. This is why I have the last bit of code where the function calls itself again in 0.1 seconds if it isn't found. I couldn't notice any delay in the button appearing on my interface despite this delay.
-(void)setupAdditionalControls {
//Call after you have initialized your MPMoviePlayerController (probably viewDidLoad)
controlView = nil;
[self recursiveViewTraversal:movie.view counter:0];
//check to see if we found it, if we didn't we need to do it again in 0.1 seconds
if(controlView) {
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[controlView addSubview:backButton];
} else {
[self performSelector:#selector(setupAdditionalControls) withObject:nil afterDelay:0.1];
}
}
-(void)recursiveViewTraversal:(UIView*)view counter:(int)counter {
NSLog(#"Depth %d - %#", counter, view); //For debug
if([view isKindOfClass:NSClassFromString(#"MPInlineVideoOverlay")]) {
//Add any additional controls you want to have fade with the standard controls here
controlView = view;
} else {
for(UIView *child in [view subviews]) {
[self recursiveViewTraversal:child counter:counter+1];
}
}
}
It isn't the best solution, but I am posting it in case someone else is trying to do the same thing. If Apple was to change the view structure or class names internal to the control overlay it would break. I am also assuming you aren't playing the video full screen (although you can play it fullscreen with embeded controls). I also had to disable the fullscreen button using the technique described here because the MPInlineVideoOverlay view gets removed and released when it is pressed: iPad MPMoviePlayerController - Disable Fullscreen
Calling setupAdditionalControls when you receive the fullscreen notifications described above will re-add your additional controls to the UI.
Would love a more elegant solution if anyone can suggest something other than this hackery I have come up with.
My solution to the same problem was:
Add the button as a child of the MPMoviePlayerController's view;
fade the button in and out using animation of its alpha property, with the proper durations;
handle the player controller's touchesBegan, and use that to toggle the button's visibility (using its alpha);
use a timer to determine when to hide the button again.
By trial-and-error, I determined that the durations that matched the (current) iOS ones are:
fade in: 0.1s
fade out: 0.2s
duration on screen: 5.0s (extend that each time the view is touched)
Of course this is still fragile; if the built-in delays change, mine will look wrong, but the code will still run.
Hopefully someone can help with this issue. I have a class derived from UIScrollView and I'd like to prevent the user from being able to zoom or scroll via manual pinch and swipe gestures. All view navigation will instead be controlled by programmatic means in response to where a user taps (think of an ebook reader where tapping on the left or right sides of the display causes the view to scroll by exactly one page width). Any suggestions on how to implement this?
On your - (void)viewDidLoad; you should be able to just disable whatever gesture recognizer you want. In this case:
UIPinchGestureRecognizer *pinchRecognizer = self.pinchGestureRecognizer;
pinchRecognizer.enabled = NO;
or
UIPanGestureRecognizer *panRecognizer = self.scrollView.panGestureRecognizer;
panRecognizer.enabled = NO;
I sometimes do this from view controllers that contain UIScrollViews. I just target the scroll view (self.scrollView.pinchGestureRecognizer) and temporarily disable gestures when the app. is in a certain state.
To prevent user-controller zooming and panning but still allow programmatic zooming and panning of a scrollview, the best approach is to override the UIScrollView's -addGestureRecognizer: method in a subclass.
In my use I wanted to block all the recognizers and control the viewable area completely from my view controller, I did so like this:
-(void)addGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer {
//Prevent any of the default panning and zooming controls from working
gestureRecognizer.enabled = NO;
[super addGestureRecognizer:gestureRecognizer];
}
Each gesture recognizer is simply disabled, for finer control (allowing the pan control but only allow zooming via a double tap for instance) you'd simply check the incoming gesture recognizer via -isKindOfClass: and disabling as appropriate.
-(void)addGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer {
//Prevent zooming but not panning
if ([gestureRecognizer isKindOfClass:[UIPinchGestureRecognizer class]]) {
gestureRecognizer.enabled = NO;
}
[super addGestureRecognizer:gestureRecognizer];
}
I used this method in a comic reading app that uses guided navigation to animate between cropped panels on a page with the full page being contained in a UIScrollView.I can smoothly zoom in and out on a selected area by simply setting the view bounds to the region I want to display.
A quick note here. It seems UIScrollView's panGestureRecognizer and pinchGestureRecognizer are both enabled the first time a view controller is added to a window.
Basically what that means is setting them to enabled = NO in viewDidLoad won't work in some cases. I moved my enabled = NO to viewWillAppear: and it stuck. :)
I don't have too much experience with UIScrollViews, but looking at the docs, it looks like you can set maximumZoomScale, minimumZoomScale, and scrollEnabled to disable everything you want to disable.
Here are the docs: http://developer.apple.com/library/ios/#documentation/uikit/reference/UIScrollView_Class/Reference/UIScrollView.html
From the docs:
scrollEnabled:
If the value of this property is YES ,
scrolling is enabled, and if it is NO
, scrolling is disabled. The default
is YES.
When scrolling is disabled, the scroll
view does not accept touch events; it
forwards them up the responder chain.
maximumZoomScale:
This value determines how large the
content can be scaled. It must be
greater than the minimum zoom scale
for zooming to be enabled. The default
value is 1.0.
In your UIScrollView subclass overwrite also the setZoomScale: method which automatically re-disables the gesture
- (void)setZoomScale:(CGFloat)zoomScale {
[super setZoomScale:zoomScale];
self.pinchGestureRecognizer.enabled = NO;
}
Sorry to be a nuisance, but I have yet ANOTHER question. How would I do something like DeskLock from macrabbit's Deskshade app? I've made the little window and that's as far as I've come. I know how to "lock" the screen in 10.6 with PresentationOptions, but I don't want to risk it because last time it wouldn't let me back in ;]
EDIT: The DeskShade app actually is meant to cover your desktop, hiding all icons. It also allows you to randomize wallpaper patterns with several fade/swipes. There is one extra feature called DeskLock that actually presents a translucent black bevel (similar to AppSwitcher build into Mac) with a lock icon, and you can place personal text. When you click the lock icon, it presents a modal that asks for a password you can set. You can also just type this password without pressing anything, followed by the Enter key, and it unlocks the screen. This uses the DeskShade feature of hiding the desktop as well.
Thanks!
To create the overlay window you have to subclass NSWindow and set its style mask and background color:
#implementation BigTransparentWindow
- (id)initWithContentRect:(NSRect)contentRect
styleMask:(NSUInteger)windowStyle
backing:(NSBackingStoreType)bufferingType
defer:(BOOL)deferCreation
{
self = [super initWithContentRect:contentRect
styleMask:NSBorderlessWindowMask //this makes the window transparent
backing:bufferingType
defer:deferCreation];
if(self)
{
[self setOpaque:NO];
[self setHasShadow:NO];
[self setBackgroundColor:[[NSColor blackColor] colorWithAlphaComponent:0.5]];
}
return self;
}
#end
You then need to set the window's frame so that it covers all screens, and you need to set its window level appropriately:
- (IBAction)showWindow:(id)sender
{
//set the window so it covers all available screens
NSRect screensRect = NSZeroRect;
for(NSScreen* screen in [NSScreen screens])
{
screensRect = NSUnionRect(screensRect,[screen frame]);
}
[yourWindow setFrame:screensRect display:YES];
if(coverScreen)
{
//set the window so it is above all other windows
[yourWindow setLevel:kCGMaximumWindowLevel];
}
else
{
//set the window so it sits just above the desktop icons
[yourWindow setLevel:kCGDesktopIconWindowLevel + 1];
}
}
As you've mentioned, you can use the NSApplicationPresentationOptions settings for NSApp to control how the user can interact with the system. An easy way to test this without locking yourself out is to set an NSTimer that calls a method that pulls the app out of kiosk mode after a timeout period.