I am trying to keep my app to one view controller so i dont have to pass information back and forth. First the user uses text fields to fill in information and then my program processes it and displays labels on an image. Is it possible to have an image view hidden until a button is clicked and then bring the image forward and display the image view on top of the text fields?
imageView.alpha = 0; // Not visible
imageView.alpha = 1; // Visible
You can put it under obe of your UIButton action.
In order for it to be on top of everything just drag the image view to be at the lowest level inside the interface builder.
Related
I am having trouble getting a uilabelview to always display on two lines. When the page first loads, the text only uses one line and is truncated. Once you load another view controller on top of it--for example an edit VC and then cancel the second VC, the label does flow to two lines which is what I want. However, I cannot get it to do first time.
Can anyone suggest what is issue? What could be different between the VC at first and then after you have shown and canceled another VC on top of it.
The label is created in storyboard. It is reference in code in viewwillappear as follows:
_myLabel.numberOfLines = 0;
NSString *nameToDisplay = _myItem.name;
[_myLabel sizeToFit];
[_myLabel setNeedsDisplay];
In my app I have a UIButton and when you tap it I have a UIActivityIndicatorView and I want to add diffrent UI Labels as it loads. Its actually not a real loading process its just for looks. How would I go about doing this?
Step 1:
Create a custom UIView (u can xibs if you want). That view should have second UIView as a container in it. When you init the view set it to be the same size as the viewController you are putting it in. Its background color is transparent (or black with a lower alpha if you want to have the greyed out effect). Set the container to be the actual size you want it to appear.
Step 2:
Put a UIActivityIndicatorView and a UILabel in the container. Lay it out how you like.
Step 3:
Write a label updating method that uses a timer. Either performSelector:afterDelay: or dispatch_after. Have this method set the label text, wait a period of time, change then text, wait a period of time, change it again and so on.
Step 4:
Write showIndicator() and hideIndicator() methods. The view and the container's hidden property should be set to true. When showIndicator() is called set the hidden to false and call the label updating method from step 3. When you've reached the end of all your label changes then set everything back to hidden = true
It should work like this. The view controller loads up and adds this view. The view takes up the entire screen but you cant see anything because it is hidden by default. The user hits the button and showIndicator() method is called. The view become visible. Although it takes up the entire screen it appears to be a small overlay because the background is transparent (or back with an alpha for the greyed out look) and the container has a smaller frame and a solid color. The delayed methods are also called now and it changes the label, waits, changes it and so on. When you reach the end of the sequence hideIndicator() is called and all views are set back to hidden = true. Good Luck!!!
Trying to create an app that uses the UIImagePickerController for its picture taking activities. I'm using a cameraOverlayView to accomplish this (for now, it just contains two buttons, one for Taking/Keeping the Picture and the other one for Canceling/Retaking). The steps below outline what is occurring.
UIImagePickerController.view (with cameraOverlayView) is shown
I click "Shoot" and the imagePicker does its magic and I'm able to get an image out of it. However going past the image acquisition section (after I dismiss the custom view), the imagePicker goes onto "still" preview screen mode without any controls other than the "<" back button at the top of the screen. I'd like to avoid that and instead continue to use my custom view provided to the cameraOverlayView to handle "Keep/Retake" actions until I'm finished.
As you can see in the image above, there is "black" band at the bottom of the view with my two custom buttons in it. I have no idea how the black band gets there since I did not add it. My custom View only has the two buttons.
Attempting to add an UIImageView on the fly (to display a still preview of the image taken to the user while still keeping my action buttons) has the effect below .
The red arrow is pointing to an extra section below the UIImage I added after acquiring the picture data from the imagePicker.
That section is actually displaying the live preview the imagePicker is constantly producing.
What I'd like to accomplish is to be able to get the bounds of that live preview section being displayed so I can calculate the correct bounds of the UIImage I'm adding on the fly since getting the height correctly will absolutely fail when ported to different devices.
Any suggestions?
I am new to Swift and app development. I have a design question. I am trying to make a view that contains a slider, but that as soon as the "touch up inside" action is performed, is replaced by a progress bar + button. If the button is pressed, then we go back to showing only the slider. This view will be not take the whole screen, only part of it.
What would be the best way of doing this? I have already investigated several options:
1. using a navigation controller with a segue triggered by the slider that goes into a new scene with a progress bar & button.
2. creating a custom view with two properties: a slider and a custom view (progress bar & button). The slider can be laid out using interface builder, and the custom view can be loaded from a nib file when needed.
3. creating a custom view with two properties: a slider and a custom view (progress bar & button). The new progress bar and button are created programmatically whenever the action is triggered on the slider.
I have already tried options 1 and 2 to some extent with no success. Since I am a beginner, I am trying to use the IB as much as possible. What is the best option (if any) from the list?
You can do this directly on the Storyboard without needing to create a custom view class, but you'll need a few lines of code in any case. Just drag a Slider into your View, and then drag a button and a progress view directly on top of that. Now select the button, and in the Attributes inspector, tick the box next to "Hidden". Do the same with the progress bar. Then just open the assistant editor and connect references to all 3 of those. You'll also need to create an action for the button (I've called it change), and make sure you leave the type field as AnyObject. Add the following line inside ViewDidLoad:
slider.addTarget(self, action: Selector("change:"), forControlEvents: .TouchUpInside)
This line just makes it so that change gets called anytime the user uses the slider. Obviously change slider to whatever you name your UISlider. You can implement the change function like this:
#IBAction func change(sender: AnyObject) {
slider.hidden = !slider.hidden
button.hidden = !button.hidden
progressBar.hidden = !progressBar.hidden
}
This is a simple implementation that just toggles between true and false for each of the items, but you'll probably want to do it differently depending on what this project does.
Now, if you want to put this functionality in multiple places in your app it might be easiest to create a custom view using the same concept as above, in which case check out this tutorial on how to create an IBDesignable UIView.
I am working on a screen where user selects an option from drop-down. Based on this selection he adds a bunch of controls to screen. My drop-down is at the bottom-right corner of the screen. It takes up 20-25% of screen space at the bottom. In the remaining 75% screen at the bottom i need to add 9 labels,6 UItext fields ,2 drop-downs and 2 buttons. I am attaching a markup here.
My question is: in ASP.NET, I have a repeater which has all the above controls. In one of the buttons named "Add More". If I click that button, it adds the same repeater at the bottom of the current one. Do we have anything like that in iOS? Like a repeater which has a bunch of controls and click add and that exact repeater is added at the bottom and so-on and so forth. If any ideas/new ideas based on my explanation pop-up then please let me know. Thanks.
The link
http://dl.dropbox.com/u/40597849/mockup2.png
So, the big rectangle to the right containing 8 labels, textboxes, drop-downs and the 2 buttons below it(one is named as "Add More") should be added again when user clicks on Add More. Please ask me if you need more information.
ITMCustomView *cView = [[ITMCustomView alloc] initWithFrame:frame];
cView.delegate =self;
CGPoint scrollPoint = CGPointMake(0.0, (frame.origin.y/400)*400);
[self.scrollView setContentOffset:scrollPoint animated:YES];
[self.scrollView addSubview:cView];
Initially the very first custom view i add, i add it with this frame size (187, 585, 350, 21); . Next whenever i hit add more i call this delegate
[self.delegate addNewSize:CGRectMake(187,self.y+ 400 , 400, 400)];
This calls the above 5 lines of code and makes a new custom view and adds it to scroll view. I store the self.y as the y value of whatever frame currently being built. So how do i make my scroll view move up and down freely. The screen shows the custom view as they are added but doesnt allow me to go up anymore. I wanted to suppose add the custom view 5 times and i added 4 i just want to scroll up , see i added 4 scroll down and just add 1 more custom view and do other processing with it. But my scroll view is non-functional and its stuck at the just added custom view disabling me to scroll up. If you need more information, please ask me. Thanks.
Use a custom view that contains all your views.
1.) Make a custom class myView which subclasses UIView.
2.) Add all the controls you need in that view class.
3.) include myView in your main view.
4.) initiate as many myView as you like and add them to your main view.
I hope that is clear enough to get you going.
Update: As to elaborate more on the comment bgoers made.
When you create a new class myView sub-classing UIView you get an empty sheet. This sheet will have the frame that you specify either in the class or when you initiate (up to you). Within that frame (myView.h and myView.m in initWithFrame), you can add subViews like buttons or labels. Those subviews will placed relative to the sheet myView.
For example, your draw up is a custom view with all the controls. I can have another one looking exactly like it by simply initiating another custom view without adding more subviews. All I need to do is move the second custom view to where I would like, all the subviews will follow.
I encourage you to read up on how to subclass and how that works in iOS. It is very simple once you get the hang of it.