Remove label from scrollview - iphone

I am creating an iPhone app in which i am using scrollview and adding labels like this :
question = [[UILabel alloc] initWithFrame:CGRectMake(22, 130, 725, 160)] ;
question.textColor = [UIColor blueColor];
question.text = [NSString stringWithFormat:#"%#" ,selected];
question.lineBreakMode = UILineBreakModeWordWrap;
[question setFont:[UIFont fontWithName:#"Futura" size:30]];
question.backgroundColor = [UIColor clearColor];
question.numberOfLines = 0;
[question sizeToFit];
[self.view addSubview:question];
[scrollview addSubview:question];
now i want to remove this label from scrollview. So how can i do this..??
i am doing this for remove object from main view.
[question removeFromSuperview];
Thanks.

There are some problems in your code. I assume that the scrollview is a subview of self.view. In this case remove the line
[self.view addSubview: question];
from you code. Depending on the rest of your code I would eventually also change the first line. If you don't need to excess the label somewhere else in your code I would change the first line to
UILabel *question = [[UILabel alloc] initWithFrame: CGRectMake(22, 130, 725, 160)];
and add a line after [scrollview addSubview: question]; with
[question release];
This would reduce you memory consumption.

Why are you adding question to the main view and to the scroll view? It doesn't make sense. Remove the [self.view addSubview:question]; line and [question removeFromSuperview]; will remove your label from the scrollview.

Related

How to set font to ALL of my text field?

I have this code and it's working :
[_fieldEmail setFont:[UIFont fontWithName:#"ABeeZee-Regular" size:14]];
[_fieldPassword setFont:[UIFont fontWithName:#"ABeeZee-Regular" size:14]];
[_fieldRegisterName setFont:[UIFont fontWithName:#"ABeeZee-Regular" size:14]];
[_fieldRegisterEmail setFont:[UIFont fontWithName:#"ABeeZee-Regular" size:14]];
[_fieldRegisterPassword setFont:[UIFont fontWithName:#"ABeeZee-Regular" size:14]];
[_titleLogin setFont:[UIFont fontWithName:#"Raleway-ExtraLight" size:28]];
[_titleRegister setFont:[UIFont fontWithName:#"Raleway-ExtraLight" size:28]];
[_titleVote setFont:[UIFont fontWithName:#"Raleway-ExtraLight" size:28]];
also I have this code to apply padding left and padding right for each text field that I have :
UIView *fieldEmail = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
_fieldEmail.leftViewMode = UITextFieldViewModeAlways;
_fieldEmail.leftView = fieldEmail;
UIView *fieldPassword = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
_fieldPassword.leftViewMode = UITextFieldViewModeAlways;
_fieldPassword.leftView = fieldPassword;
UIView *fieldRegisterName = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
_fieldRegisterName.leftViewMode = UITextFieldViewModeAlways;
_fieldRegisterName.leftView = fieldRegisterName;
UIView *fieldRegisterEmail = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
_fieldRegisterEmail.leftViewMode = UITextFieldViewModeAlways;
_fieldRegisterEmail.leftView = fieldRegisterEmail;
UIView *fieldRegisterPassword = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
_fieldRegisterPassword.leftViewMode = UITextFieldViewModeAlways;
_fieldRegisterPassword.leftView = fieldRegisterPassword;
but I think it's an ugly code. because I have to set every text field and label one by one. Is it any better way to simplify this?
thank you very much..
I wouldn't do this way. If you check your code, you have a lot of similar pattern for your TextField.
Why don't create customTextField which is inherited from UITextField? And then, what you need is set font, leftViewMode and leftView in your customTextField class. When use it, just alloc with frame. Done!
In iOS 5 and later you can use the UIAppearance API to give a consistent style to your controls. Which iOS framework are you targeting?
OR
As suggested by Brain you can create a custom TextField and use that instead of UITextField. Your custom TextField would of course inherit from the UITextField but it will change different properties which you desire.
Make two arrays:
NSArray* fields= #[ _fieldEmail, _fieldPassword, _fieldRegisterName, _fieldRegisterEmail, _fieldRegisterPassword ];
NSArray* titles = #[ _titleLogin, _titleRegister, _titleVote ];
Then use makeObjectsPerformSelector:withObject: to execute a method call on all the array objects:
UIFont* font1= [UIFont fontWithName: #"ABeeZee-Regular" size: 14];
UIFont* font2= [UIFont fontWithName:#"Raleway-ExtraLight" size:28];
[fields makeObjectsPerformSelector: #selector(setFont:) withObject: font1];
[titles makeObjectsPerformSelector: #selector(setFont:) withObject: font2];
As for the second task you can simply use iteration and put the created UIView objects in a mutable array, if you need to use them later. If you want call them by name, then also a dictionary is a good idea:
NSArray* keys= #[ #"fieldEmail", #"fieldPassword", #"fieldRegisterName", #"fieldRegisterEmail", "fieldRegisterPassword" ];
NSMutableDictionary* fieldsDict= [[NSMutableDictionary alloc] init];
for(NSString* key in keys) {
UIView* field= [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
field.leftViewMode= UITextFieldViewModeAlways;
field.leftView= field; // I hope that this property is weak
[fieldsDict setObject: field forKey: key];
}
You could try to loop through all the subviews and check if they are an instance of UITextField or any subclass of UITextField. If they are, you can set the font property.
I quickly wrote some sample code to show you how you could do this:
for (UIView *subview in [[self view] subviews]) {
if ([subview isKindOfClass:[UITextField class]]) {
UITextField *textField = (UITextField *)subview;
[textField setFont:[UIFont fontWithName:#"ABeeZee-Regular" size:14.f]];
}
}
Be aware of the fact that this code only loops through the 'closest' children of [self view] and thus won't modify views deeper in the hierarchy.

Dynamic placing of labels and buttons in UIView

I want to know if there is a dynamic way of populating an UIView.
For example, Consider I have a couple of UILabels aligned as rows, whose text is again dynamic.
If the text for the first UILabel has multiple lines, I know I can call
[myLabel sizeToFit];
to resize itself based on its content.
Is there an easy way of propagating this information to all the subviews (UILabels in my case) of the UIView and making them and respace them accordingly.
I hope I am clear enough.
For two labels that should be aligned as rows, you can use the CGRectGetMaxY function. For example :
UILabel *first = [[UILabel alloc] initWithFrame:CGRectMake(10.0f,20.0f, 100.0f, 200.0f)];
[first setText:#"Text to display"];
[first sizeToFit];
[self.view addSubview:first];
[first release];
UILabel *second = [[UILabel alloc] initWithFrame:CGRectMake(10.0f, CGRectGetMaxY(first.frame), 100.0f, 200.0f];
[second setText:#"Text to display"];
[second sizeToFit];
[self.view addSubview:second];
[second release];
UILabel *third = [[UILabel alloc] initWithFrame:CGRectMake(10.0f, CGRectGetMaxY(second.frame), 100.0f, 200.0f];
[third setText:#"Text to display"];
etc...
You can also know the expected size of a label according to its text parameter doing this :
NSString *text = #"Text to display";
CGSize size = [text sizeWithFont:[UIFont fontWithName:#"HelveticaNeue" size:10.0f] constrainedToSize:CGSizeMake(100.0f, FLT_MAX) lineBreakMode:UILineBreakModeTailTruncation];
UILabel *first = [[UILabel alloc] initWithFrame:CGRectMake(10.0f, 20.0f, 100.0f, size.height)];
[first setText:text];

UITextView, user scrolls uitextview but then it snaps back to original position, whats wrong?

I currently have a UITextView which is contained in a UIViewController using the following code:
UIViewController *container = [[UIViewController alloc] init];
container.view.frame = CGRectMake(0, 0,
[UIScreen mainScreen].bounds.size.width, 1000);
//[UIScreen mainScreen].bounds.size.height
container.view.userInteractionEnabled = YES;
container.view.clipsToBounds = YES;
UIImageView *imgView = [[UIImageView alloc]
initWithImage:[UIImage imageNamed:#"myImage.png"]];
imgView.frame = container.view.frame;
imgView.userInteractionEnabled = YES;
[container.view addSubview:imgView];
[imgView release];
UITextView *textContained = [[UITextView alloc]
initWithFrame:CGRectMake(0, 0, container.view.bounds.size.width, 1000)];
//container.view.bounds.size.height
textContained.font = [UIFont fontWithName:#"Calibri" size:14];
textContained.scrollEnabled = YES;
textContained.editable = NO;
textContained.textColor = [UIColor whiteColor];
textContained.backgroundColor = [UIColor clearColor];
textContained.font = [UIFont boldSystemFontOfSize:14];
textContained.userInteractionEnabled = YES;
textContained.alwaysBounceVertical = YES;
textContained.contentSize = CGSizeMake(container.view.frame.size.width,
container.view.frame.size.height);
I then set my UItextView text property with some text, which extends past the current screen size. I then add my UITextView to my container using the following code.
switch (indexPath.row) {
case 0:
textContained.text = #"LOTS AND LOTS OF TEXT";
[container.view addSubview:textContained];
[self.navigationController pushViewController:container animated:YES];
[textContained release];
break;
default:
break;
}
[container release];
When I test this code, the text appears just fine in the UITextView and everything looks ok. But the problem is when I try to scroll down to see the remainder of the text. Everytime I scroll down the UITextView scrolls back in to its original position. I have tried several ways to get this to work, but I think I need some fresh eyes to see what I'm doing wrong.
Any help is greatly appreciated.
First, you don't want to set the contentSize of a UITextView, since it is determined by the length of text automatically.
Try to make the height of textView smaller. For example:
UITextView *textContained = [[UITextView alloc]
initWithFrame:CGRectMake(0, 0, container.view.bounds.size.width, 50)];
And give it more text, like:
textContained.text = #"LOTS AND LOTS OF TEXT\nLOTS AND LOTS OF TEXT\nLOTS AND LOTS OF TEXT\n\nLOTS AND LOTS OF TEXT\nLOTS AND LOTS OF TEXT\n";

objective c addSubview order

i am a junior programmer
I face a problem of some of the subview in the program not shown ,
don't know if it is the addsubview order problem or the others .
hope if anyone can provide a suggestion or solution .thanks all
for (int i = 0; i < NUM_DISHES; i++) {
UIImageView* img_steps = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[NSString stringWithFormat:#"%d.jpg", i]]];
//IMPORTANT: The i*W_IPAD means that 1st 0*1024 , 1*1024 , 2*1024.............and so on
[img_steps setFrame:CGRectMake(W_IPAD, 0, W_IPAD , H_UPFR)];
UIImageView* imageset = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[ary_img objectAtIndex:i]]];
[imageset setFrame:CGRectMake(89, 9, H_INGREPHOTO, W_INGREPHOTO)];
[ary_image addObject:imageset];
//ingredient amount section
UILabel* lbl_amt = [[UILabel alloc] initWithFrame:CGRectMake(128, 177, 190, 33)];
[lbl_amt setText:[ary_amount objectAtIndex:i]];
[lbl_amt setFont:[UIFont systemFontOfSize:25]];
[lbl_amt setTextColor:[UIColor blackColor]];
[lbl_amt setBackgroundColor:[UIColor clearColor]];
[ary_amt addObject:lbl_amt];
//method section
UILabel* lbl_method = [[UILabel alloc] initWithFrame:CGRectMake(596, 93, 130, 32)];
[lbl_method setText:[ary_meth objectAtIndex:i]];
[lbl_method setBackgroundColor:[UIColor clearColor]];
[lbl_method setFont:[UIFont systemFontOfSize:30]];
[lbl_method setTextColor:[UIColor blackColor]];
[ary_method addObject:lbl_method];
//alpha bar step number step number section
UILabel* lbl_numberstep = [[UILabel alloc] initWithFrame:CGRectMake(90 + (130 * i), 5, W_NUMBERSTEP, H_NUMBERSTEP)];
[lbl_numberstep setText:[NSString stringWithFormat:#"%d",i + 1]];
[lbl_numberstep setFont:[UIFont systemFontOfSize:20]];
[lbl_numberstep setBackgroundColor:[UIColor clearColor]];
[lbl_numberstep setTextColor:[UIColor blackColor]];
[self.view addSubview:img_steps];
[alpha_bar addSubview:lbl_numberstep];
[alphaframe addSubview:[ary_method objectAtIndex:i]];
[alphaframe addSubview:[ary_amt objectAtIndex:i]];
[alphaframe addSubview:[ary_image objectAtIndex:i]];
}
// Section --- Add Subview
[self.view addSubview:background];
[background addSubview:main_view];
[main_view addSubview:alpha_bar];
[main_view addSubview:alphaframe];
[main_view addSubview:but_transit_to_a]; //can add to the main_view
[main_view addSubview:left_buttom];
[main_view addSubview:right_buttom];
[alpha_bar addSubview:bar];
[alpha_bar addSubview:lbl_lastnum];
[alphaframe addSubview:but_transit_to_c];
}
return self;
}
To bring the subview to front you can use [yourMainView bringSubviewToFront:yoursubview]. If your subview isn't showing then, check that you've properly set up the subview's frame and that hidden = NO.
The view.subviews array holds the bottom-most view in index zero, and holds views in an order relating to their "z-index". So [myView.subviews lastObject]; will always give the view in front of all other views and [myView.subviews objectAtIndex:0]; will have the view below all views in that array.
From the UIView docs - subviews property:
You can use this property to retrieve the subviews associated with
your custom view hierarchies. The order of the subviews in the array
reflects their visible order on the screen, with the view at index 0
being the backmost view. For complex views declared in UIKit and other
system frameworks, any subviews of the view are generally considered
private and subject to change at any time. Therefore, you should not
attempt to retrieve or modify subviews for these types of
system-supplied views. If you do, your code may break during a future
system update.

Text is not getting placed as mentioned in CGRect frame of UILable

this might look simple but i am not able to Find the solution for this...when i use this below code the text get placed at right postion as mentioned in the CGRect frame.
[self.view addSubview:[self createLabel:CGRectMake(50,480,50,20):#"Status:"]];
-(UILabel*)createLabel:(CGRect)frame :(NSString*)labelTitle
{
UILabel *myLabel = [[UILabel alloc] initWithFrame:frame];
[UIFont fontWithName:#"Arial" size:13];
myLabel.textAlignment = UITextAlignmentLeft;
}
But when i use this below Code the text is getting placed at rightmost corner of the frame...its not getting placed at right position as mentioned in the CGRect frame..can anyone tell whats the problem happening with this..
[self.view addSubview:[self createLabel:CGRectMake(50,340,150,20):aRequests.request_details]];
NOTE:aRequests.request_details is coming from webservices..
Your method doesn't return any object. Try to add return myLabel; at the end of it.
And you are not setting new title: myLabel.text = labelTitle;