I have designed a UIView in storyboard and the parent view is a tableview. But I want to set it hidden or unhidden depend on my decision.How can I do?
Get the view by tag? Or any other method？
I put up the code:
UIView *myview=[[UIView alloc] viewWithTag:99];
myview.hidden=true;
But it does not work!
Give the IBOutlet to the UIView in storyboard
#property(nonatomic, weak)IBOutlet UIView *subView;
In the ViewDidLoad or ViewWillAppear
put this line
subView.hidden=YES;
You should replace this line UIView *myview=[[UIView alloc] viewWithTag:99];
with
UIView *myview = [self.view viewWithTag:99];
if you have added on the main view and then try setting the view hidden.
Try writing this code in viewDidAppear.
Related
I do not understand why my code will not place this custom view on top of the main view. Any suggestions would be great.
Here is my code:
.h
#property (strong, nonatomic) IBOutlet UIView *saved;
.m
self.saved = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)];
self.saved.backgroundColor = [UIColor colorWithRed:0.0/255 green:102.0/255 blue:153.0/255 alpha:1];
[self.view bringSubviewToFront:self.saved];
You need to add as subview [self.view addSubview:self.saved]; before call bringSubviewToFront.
One note: you have declared your property as IBOutlet, this macro is to denote variables that can be referred to in Interface Builder. In case you plan to create and include the subview from the Interface Builder, it is not necessary to initialise and add as subview through code.
I have a very simple UIView, that is only drawing a triangle. It implements a UIView drawRect method that is drawing a figure. It is working fine on iOS7, but when I run the same code on iOS8 it is not even called. Any ideas what has changed on iOS8? My code in nutshell:
#interface MyView : UIView
#end
#implementation MyView
- (instancetype)init {
self = [super init];
if (self) {
self.backgroundColor = [UIColor clearColor];
}
return self;
}
- (void)drawRect:(CGRect)rect {
// draw things
}
#end
myView = [MyView new];
[self addSubview:myView];
Update
My view hierarchy: UIViewController View->Custom UILabel->MyView
It is an error message bubble, and my view is a beak pointing to something.
I have used a new UI debugging tool, but it is not visible there. Init method is called, drawRect is not. Something must have changed in iOS8, because iOS7 is calling drawRect.
Update 2
Of course I'm using constraints (and Masonry pod), and this is why I did not specify the frame.
[myView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(make.superview.mas_bottom);
make.centerX.equalTo(make.superview);
make.width.equalTo(#10.0f);
make.height.equalTo(#5.0f);
}];
I have also tried adding [myView setNeedsDisplay] in various places, but it didn't help.
Problem finally solved. I'm not sure what exactly caused the issue (Masonry [constraints framework] or iOS8 changes to UILabel), but the solution was to change the view hierarchy. I created another UIView that contains both UILabel and my UIView (drawn beak) instead of adding the UIView to UILabel as subview. Now drawRect method is called both on iOS7 and iOS8.
Previous hierarchy:
UIViewController View->Custom UILabel->MyView
New hierarchy:
UIViewController View->Container UIView->Custom UILabel & MyView
To sum up, if your drawRect method is not called on iOS8, and you are adding some UIView to UILabel as subview, try to use some container which will contain both UIView and UILabel.
make sure that myView's superview property clipToBounds = NO, and that myView rect is on screen
There is an important detail missing in your approach. You need to specify a frame that determines the origin and size of your view. This can be done with the initWithRect method of UIView, or you can set the frame after allocation/initialization. Since you have a custom init method already I would do the following:
myView = [MyView new];
myView.frame = CGRectMake(0.0,0.0,100.0,100.0);
[self addSubview:myView];
This will draw your custom view with an origin point of (0.0,0.0) and a width and height of 100.0.
Furthermore, adding a call to setNeedsDisplay should force the drawRect method to be called if you are still having trouble:
[myView setNeedsDisplay];
I already have the code to animate UIPickerView to act like iOS keyboard, but the problem is when it's loaded for the first time, the UIPickerView is already shows up. I want to hide it first outside UIView area, until UIButton tapped. so it will animate just like iOS keyboard.
here's the picture to illustrate what I mean :
how can it be done? thank you.
Just set the frame of pickerView accordingly while initiating.
UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(100, 900, 200, 200)];
if you want pickerView to appear from bottom then increase the y co-ordinate and if you want pickerView to appear from right then increase the x co-ordinate value
if pickerView is on the UIView which is again on some UIViewController then set the ClipsToBounds to YES.
[yourView setClipsToBounds:TRUE];
Hope this will help you.
Sorry i cant comment so answering from this I think you are already placed an UIpicker view in your view concept is same as #xman said. If you didnt place picker view place it
then in .h create property for picker view
#interface ViewController : UIViewController
{
IBOutlet UIPickerView *statepicker;
}
#property (weak, nonatomic) IBOutlet UIView *statepickerview;
in .m first synthesize
#implementation ViewController
#synthesize statepickerview;
in viewdidLoad initially set frame of picker view out of view example
- (void)viewDidLoad
{
statepickerview.frame = CGRectMake(-9, 506, 367, 263);
[super viewDidLoad];
}
then in action call the frame to visible postion
- (IBAction)ButtonPress:(id)sender {
statepickerview.frame = CGRectMake(0, 250,321, 260);
}
when you press button if it is not visible then try to change the co-ordinates
If this not works properly check this link create view and place the picker view inside the custom view and change the frame size of the view
see this link surely it will help
You can set pickerview's y position with your window's height. Like this :
[self.view addSubview:pickerView];
pickerView.frame = CGRectMake(0, appDelegate.window.frame.size.height,pickerView.frame.size.width,pickerView.frame.size.height)
You have to add pickerview in your view and then set frame of it.
I found answer... case closed... it's all because of 'AutoLayout' is enabled on my XCode Project... when it's disabled, everything works as I expected.
I have a subclassed UIView with a special behavior.
It is a custom class of a ViewController xib view. It contains a subview, which is currently created programmatically.
My question is; how to pass a subview either from the xib or from one created programmatically in the viewController via initWithFrame or initWithCoder to my subclassed view? (Right now it simply acts through the view, not initiated at all in the VC.)
I would share code, but I don't know that it's necessary.
Use the initWithFrame method:
SubclassedView *view = [[SubclassedView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
[self.view addSubview:view];
Be sure to import #import "SubclassedView.h"
CustomView *customView = [...];
[self.view addSubview:customView];
I need to detect in my CustomView class when it is added in other views or when my superview changes.
You can use willMoveToSuperview: and didMoveToSuperview to detect when the view is moved around. layoutSubviews will be called when the superview changes frame.
For a UIView use - (void)didMoveToSuperview
For a UIViewController use -(void)viewWillAppear:(BOOL)animated
also assign THE TAG of Customview before addsubview and the detect by Particular TAG.