How to create a view hierarchy programmatically without using a nib?

How to create a view hierarchy programmatically without usin开发者_Python百科g a nib ?

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The whole view hierarchy can be constructed using successive UIView construction and -addSubview: methods.

For instance, to create an input form one may use

UIView* rootView = [[UIView alloc] initWithFrame:...];
// apply style to rootView
[window addSubview:rootView];
[rootView release];

UILabel* inputLabel = [[UILabel alloc] initWithFrame:...];
// apply style to label
[rootView addSubview:inputLabel];
[inputLabel release];

UITextField* inputField = [[UITextField alloc] initWithFrame:...];
// apply style to text field
[rootView addSubview:textField];
[textField release];

and so on.