The layout of an UIView in iPhone Application can be created and modified either by the Interface Builder or by code. If you make it by Interface Builder, you have to wire the items u created to File Owner.
On the other hand, u can make an Item on the UIView by code. The following example will created a “Hello World” UILabel at coordinate (10, 15) with size equals to 40 x 20;
// Create the UILabel instance UILabel *aLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 15, 40, 20)]; // Set the tag of aLabel aLabel.tag = 1; // Set the text aLabel.text = @"Hello World"; // Add the UILabel view to UIView associated with the controller [self.view addSubview:aLabel]; // Release the memory [aLabel release];
You can add different items such as UIImageView, UITextField etc. Please note that the view tag is the only field to distinguish different subviews.
To remove all the subviews except the one with tag equals to 1, you can use
for (UIView *subview in [self.view subviews]) {
// Only remove the subviews with tag not equal to 1
if (subview.tag != 1) {
[subview removeFromSuperview];
}
}
Done =)
Update @ 2011-06-18: Added the “Release the memory” code. Thanks Luke. =)
Eureka! 
Hi,
I am having trouble, I am trying to add subviews to a view, like a grid each grid is a UIVIew a sub view.
My algorithm can only add 4, 5 or more grids won’t work.
Maybe it is a app delegate issue, I don’t know what the bug is, but I hope I find out soon,
Thanks
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Hi Robert,
do you mean you got errors when you add too many subviews? if yes, what errors did u get?
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You might want to add a
[aLabel release];
at the end otherwise you’ll have memory issues;
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Thanks for your suggestion. i am really not good in those memory stuff. =P
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Thanks man, you help me a lot.
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good to know that i could help =D
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i have 2 uiview in my xib file and
i have create a button and the action of that button is wen it pressed it goes to the secont view i have done it using [self.view subviews:view1]; function
but the problem cums wen wen i give the similar action to the button on the second uiview
using the same function what shud i do….??
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Take a look at the UIView class reference about [self.view subviews]
UIView – subviews
It returns an array of the immediate subviews of self.view. so u shouldn’t use it for switching subviews.
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THE HOW SHUD i do it…?
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Do you want to do a navigation feature so you can switch the view? if yes, you can take a look on the following tutorials
UINavigationController tutorial w/ multiple xibs and data sharing
Actually you can find many example code by Google~ try to start building some simple apps first in order to get a basic concept on iphone app development.
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hey cud u give me a link of a gud tutorial for x.code and ios development as i have just started it
and i am not having much of an idea abt it…..!
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You can refer to the links in the following post.
iPhone – Start Developing Your First iPhone Application
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thankx 🙂
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Awesome, Thank You! 🙂
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You are welcome. =D
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