Open Radar

 
16-Mar-2012 02:37 PM Kristopher Johnson:
Summary: When developer creates a new UIView subclass using the "Objective-C Class" template, the generated code includes an implementation of -initWithFrame: with a place for view-initialization code to be written. This will work fine if the class is instantiated programmatically. However, if the developer places an instance of the new UIView subclass into a NIB, the developer may be surprised that the initialization code does not execute. This is due to the fact that when loaded from a NIB, a view's -init method is not called; instead its -awakeFromNib method is called.

Any UIView subclass with initialization code in its -init method will probably need identical or similar code in its -awakeFromNib. However, new iOS developers may not know this, and experienced iOS developers can easily overlook the need for -awakeFromNib. To prevent these problems, the UIView subclass template should include -awakeFromNib.

It would also be helpful to prevent the need to write the initialization code twice, so template code like this would be useful:


@implementation MyView

- (void)setup_MyView {
    // initialization code to be executed by either -initWithFrame or -awakeFromNib
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setup_MyView];

        // other initialization code for programmatic instantiation
    }
    return self;
}

- (void)awakeFromNib {
    [super awakeFromNib];

    [self setup_MyView];

    // other initialization code for loading from NIB
}


Steps to Reproduce:In Xcode with a project open, choose the File > New > File.. menu item, select iOS > Cocoa Touch > Objective-C Class and click Next, enter a new class name and choose UIView from the "Subclass of" list and click Next, and click Create.

Expected Results: Generated code implements both -initWithFrame: and -awakeFromNib, and the view works fine whether generated programmatically or loaded from a NIB

Actual Results: Generated code only implements -initWithFrame, and if developer puts any non-trivial code within it, the view does not work when loaded from a NIB.

Regression:

Notes: