I have set up an application and used some of the basic code from "The iPhone Developer's Cookbook" to create a simple view. The application works correctly in portrait mode, but when it is rotated, the dimensions of the boxes stay the same. Here is my code:
- (void)loadView {
//Create the full application frame (minus the status bar) - 768, 1004
CGRect fullRect = [[UIScreen mainScreen] applicationFrame];
//Create the frame of the view ie fullRect-(tabBar(49)+navBar(44)) - 768, 911
CGRect viewRect = CGRectMake(0, 64, fullRect.size.width, fullRect.size.height-93.0);
//create the content view to the size
contentView = [[UIView alloc] initWithFrame:viewRect];
contentView.backgroundColor = [UIColor whiteColor];
// Provide support for autorotation and resizing
contentView.autoresizesSubviews = YES;
contentView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
self.view = contentView;
[contentView release];
// reset the origin point for subviews. The new origin is 0,0
viewRect.origin = CGPointMake(0.0f, 0.0f);
// Add the subviews, each stepped by 32 pixels on each side
UIView *subview = [[UIView alloc] initWithFrame:CGRectInset(viewRect, 32.0f, 32.0f)];
subview.backgroundColor = [UIColor lightGrayColor];
[contentView addSubview:subview];
[subview release];
subview = [[UIView alloc] initWithFrame:CGRectInset(viewRect, 64.0f, 64.0f)];
subview.backgroundColor = [UIColor darkGrayColor];
[contentView addSubview:subview];
[subview release];
subview = [[UIView alloc] initWithFrame:CGRectInset(viewRect, 96.0f, 96.0f)];
subview.backgroundColor = [UIColor blackColor];
[contentView addSubview:subview];
[subview release];
}
Is there any way to have this reload with the new dimensions when it is rotated or a better way of accommodating the orientation change?
Thanks
JP
I may be misunderstanding your problem. By "boxes", do you mean the subviews?
If so, the subviews will retain their apparent dimensions when rotated because they are squares.
In any case, viewDidLoad is only called when a view is first initialized, usually from a nib. If you need to make changes to a view when it rotates, you need to make the changes in willRotateToInterfaceOrientation:duration: and/or didRotateFromInterfaceOrientation:.
To change the dimensions of any view, simply reset its frame.
object.autoresizingMask=UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin|UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
Related
In my browser application I am using NSURL connection to download a file if the response is a pdf file.
When I receive data I show a UIprogressView to show the download status.
I want to disable and change the color of background view until the download is complete.
In didReceiveResponse delegate I call a method to create progressView and change backgroundcolor and disable the parentView
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
[self.fileData setLength:0];
self.totalFileSize = response.expectedContentLength;
[self performSelectorOnMainThread:#selector(startProgressView) withObject:nil waitUntilDone:NO];
}
-(void) startProgressView
{
CGSize frameSize = self.view.frame.size;
CGFloat margin = 30.0;
CGPoint center = self.view.center;
topLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, margin, frameSize.width-2*margin, 20.)];
bottomLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, margin, frameSize.width-2*margin, 20.)];
[topLabel setText:#"downloading file"];
[topLabel setCenter:CGPointMake(center.x, center.y - 20.)];
[topLabel setTextAlignment:NSTextAlignmentCenter];
[bottomLabel setText:#"downloadstatus"];
[bottomLabel setCenter:CGPointMake(center.x, center.y + 20.)];
[bottomLabel setTextAlignment:NSTextAlignmentCenter];
self.progressBar = [[UIProgressView alloc] initWithFrame:
CGRectMake(0, margin, frameSize.width-2*margin, 20.)];
[self.progressBar setProgress:0];
[self.progressBar setCenter:center];
[self.view addSubview:topLabel];
[self.view addSubview:(self.progressBar)];
[self.view addSubview:bottomLabel];
/*
CGRect frame = CGRectMake(0.0, 0, self.view.bounds.size.width, self.view.bounds.size.height);
UIView *v = [[UIView alloc] initWithFrame:frame];
[v setBackgroundColor:[[UIColor alloc] initWithRed:255.0
green:0.0
blue:0.0
alpha:0.1]];
[self.view insertSubview:v atIndex:0];
[v release];
*/
[self.view setBackgroundColor: [UIColor colorWithRed:0.0 green:255.0 blue:128.0/255 alpha:0.5]];
[self.view setUserInteractionEnabled:NO];
}
I tried setting background color and even inserting a new view with color but background color doesn't change.
Can someone point out if there is anything that I am missing.
Thanks all for your advise. I figured out the reason of background color not being visible.
the main view of viewcontroller(self.view) contain 3 more subview on top of it, and changing the background color of self.view is not visible because of the subviews.
To change the background color I just create another view with
CGRect frame = CGRectMake(0.0, 0, self.view.bounds.size.width, self.view.bounds.size.height);
backgroundView = [[UIView alloc] initWithFrame:frame];
[backgroundView setBackgroundColor:[[UIColor alloc] initWithRed:204./255 green:213./255 blue:216./255 alpha:0.5]];
[self.view addSubview:backgroundView];
and add it to the self.view before adding the progressView to it.
The background color of a progress view is barely visible.This is an image of a progress view with red background color:
Like you see the red color is only in a little portion of the image.
As for how to change it, it's enough to set it's property:
yourView.backgroundColor=[UIColor redColor];
// make it the color that you wish
If you want to see it well change it to another kind of view, or change the progressTintColor property.
EDIT
If the view hasn't something that you want to override on the background, you can freely subclass it and draw inside it.
I watched the documentation, it seems like you don't even need a UIBezierPath instance like with Mac OS X:
- (void) drawRect:(CGRect)rect
{
[[UIColor redColor] set];
UIRectFill(rect);
}
I am trying to add a UIView over the current view, but having no luck.. I am sure my code is correct but not sure what else to check, what else should I be thikning about when inserting subviews
this is what I have added into viewDidLoad
//..
cellContainer = [[UIView alloc] init];
cellContainer.frame = CGRectMake(0.0, 480.0, 320.0, 300.0);
[self.view addSubview:cellContainer];
self.view.backgroundColor = [UIColor greenColor];
//..
cellContainer is declared in the header as a UIView... any help would be appreciated.
cellContainer is likely getting added to the view hierarchy of of the UIViewController, but you've set the frame such that it is offscreen. Try this:
cellContainer = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 300)];
[self.view addSubview:cellContainer];
self.view.backgroundColor = [UIColor greenColor];
This will display cellContainer at the top left of the view, extending 320px in the right-x direction, and 300px in the down-y direction.
I am doing an application where i am creating a UILabels programmitically,As i will be creating some 15 labels with different frames so i using only one method and calling it by parameter passing.
when i rotate it to Landscape view the position of the labels should be changed as there will lot of space left empty at right side..so i am trying to use Autoresizing mask but its not working,so please suggest what i should do so that label frame changes and fits at right position when i turn to landscape orientation. please provide me a sample code.The present code i am using is given below.
{
[self.view addSubview:[self createLabel:CGRectMake(450,140,60,20):#"Ratings:"]];
[self.view addSubview:[self createLabel:CGRectMake(450,170,60,20):#"Reviews:"]];
[self.view addSubview:[self createLabel:CGRectMake(50,170,50,20):#"Hours:"]];
[self.view addSubview:[self createLabel:CGRectMake(50,200,50,20):#"Phone:"]];
self.view.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleWidth;
[super viewDidLoad];
}
-(UILabel*)createLabel:(CGRect)frame :(NSString*)labelTitle
{
UILabel *myLabel = [[UILabel alloc] initWithFrame:frame];
[UIFont fontWithName:#"Arial" size:13];
myLabel.textAlignment = UITextAlignmentLeft;
myLabel.font = [UIFont boldSystemFontOfSize:13];
myLabel.text = labelTitle;
[myLabel autorelease];
return myLabel;
}
You should set also autoresizingMask to all subview of self.view - add, for example, next line in the -(UILabel*)createLabel:(CGRect)frame :(NSString*)labelTitle method:
myLabel.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleWidth;
or
myLabel.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleWidth;
I have a question regarding the implementation of loadView:
Right now, I have it like this:
- (void)loadView
{
image = [UIImage imageNamed:#"plan.gif"];
scrollView=[[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
imageView = [[UIImageView alloc] initWithFrame:
CGRectMake(0, 0,scrollView.frame.size.width + 40, scrollView.frame.size.height)];
imageView.image = image;
[imageView setContentMode:UIViewContentModeCenter];
scrollView.contentSize = image.size;
scrollView.maximumZoomScale = 3.0;
scrollView.bounces = NO;
scrollView.delegate = self;
// do any further configuration to the scroll view
// add a view, or views, as a subview of the scroll view.
[scrollView addSubview:imageView];
// release scrollView as self.view retains it
self.view=scrollView;
[scrollView release];
}
I suppose some of it should be in viewDidLoad:?
Thanks in advance.
This seems fine to me.
viewDidLoad is normally used as your hook after getting a view returned from IB. In this case you are essentially just doing the work of IB in code (setting up the view heirachy and configuring it).
Therefore in this case I think splitting out the logic may be superfluous unless it makes your code more readable.
I've been trying out some of the view code from Erica Sadun's book "The iPhone Developer's Cookbook" and found some code I don't understand. Here's the code for a loadView method:
- (void)loadView
{
// Create the main view
UIView *contentView = [[UIView alloc] initWithFrame:
[[UIScreen mainScreen] applicationFrame]];
contentView.backgroundColor = [UIColor whiteColor];
self.view = contentView;
[contentView release];
// Get the view bounds as our starting point
CGRect apprect = [contentView bounds];
// Add each inset subview
UIView *subview = [[UIView alloc]
initWithFrame:CGRectInset(apprect, 32.0f, 32.0f)];
subview.backgroundColor = [UIColor lightGrayColor];
[contentView addSubview:subview];
[subview release];
}
My question is why does she release contentView, but then use it again in [contentView addSubview:subview]? Has self.view = contentView retained contentView?
If you look in the documentation for UIViewController, you'll see that the view property is declared as:
#property(nonatomic, retain) UIView *view;
This means that when you use the setView: method (or use .view on the left hand side of the =), then whatever value you pass in will be retained. So, if you go through the code and look at retain counts, you'll get this:
- (void)loadView {
// Create the main view
UIView *contentView = [[UIView alloc] initWithFrame:
[[UIScreen mainScreen] applicationFrame]]; //retain count +1
contentView.backgroundColor = [UIColor whiteColor]; //retain count +1
self.view = contentView; //retain count +2
[contentView release]; //retain count +1
// Get the view bounds as our starting point
CGRect apprect = [contentView bounds];
// Add each inset subview
UIView *subview = [[UIView alloc]
initWithFrame:CGRectInset(apprect, 32.0f, 32.0f)];
subview.backgroundColor = [UIColor lightGrayColor];
[contentView addSubview:subview];
[subview release];
}
I'd say that the really interesting thing is that after releasing contentView, we can still send messages to it, because the object living at the end of contentView's pointer still exists (since it was retained by calling setView:).
If u declare ur property like so
#property(nonatomic,retain) ...
TheN yes the property is retained when assigned. that is probably what's going on