When you click textField, there is no response and the created view (UI) is not displayed on the screen. textfieldui

When you click textField, there is no response and the created view (UI) is not displayed on the screen. textfieldui
I. Click textField and there is no response
(1) There is a view above textField (as shown below)
UITextField * tf = [[UITextField alloc] initWithFrame: CGRectMake (50,100,220, 40)];
Tf. backgroundColor = [UIColor yellowColor];
Tf. borderStyle = UITextBorderStyleRoundedRect;
[Self. window addSubview: tf];
[Tf release];

UIView * view = [[UIView alloc] initWithFrame: CGRectMake (0, 0,320,568)];
View. backgroundColor = [UIColor redColor];
[Self. window addSubview: view];

[View release];

(2) textField is out of the management scope of the parent view.
A view can manage all the child views within its range. If the child view exceeds the parent view range, it cannot respond to interaction (as shown below)
UIView * bgView = [[UIView alloc] initWithFrame: CGRectMake (0, 0,100,100)];
BgView. backgroundColor = [UIColor redColor];
// Cut down the child views beyond the management scope of the current view.
BgView. clipsToBounds = YES;
[Self. window addSubview: bgView];
[BgView release];

UITextField * tf = [[UITextField alloc] initWithFrame: CGRectMake (0, 20,320, 40)];
Tf. backgroundColor = [UIColor greenColor];
Tf. borderStyle = UITextBorderStyleRoundedRect;
[BgView addSubview: tf];

[Tf release];

(3) Click not to respond to problems (as shown below)
UITextField * tf = [[UITextField alloc] initWithFrame: CGRectMake (50,200,220, 40)];
Tf. backgroundColor = [UIColor greenColor];
// Set whether to edit
// Tf. enabled = NO;
// Set whether to respond to user interaction
Tf. userInteractionEnabled = NO;
Tf. borderStyle = UITextBorderStyleRoundedRect;
[Self. window addSubview: tf];
[Tf release];


(4) The parent view of textField cannot be interacted (as follows)
// UILabel disables user interaction by default.
UILabel * view = [[UILabel alloc] initWithFrame: CGRectMake (0, 0,320,100)];
View. backgroundColor = [UIColor redColor];
View. userInteractionEnabled = YES;
[Self. window addSubview: view];
[View release];

UITextField * tf = [[UITextField alloc] initWithFrame: CGRectMake (0, 40,320, 40)];
Tf. backgroundColor = [UIColor greenColor];
Tf. borderStyle = UITextBorderStyleRoundedRect;
[View addSubview: tf];
[Tf release];

 
2. The created view is not displayed on the screen.
(1) not added to the parent view (as shown below)
UIView * view = [[UIView alloc] initWithFrame: CGRectMake (0, 0,320,300)];
View. backgroundColor = [UIColor redColor];
[Self. window addSubview: view];
[View release];


(2) No color is set for the view, and the color is still clearColor.
(3) frame not set
(4) The view creation method is not called.
(5) The added parent view is nil.
UIView * view = nil;
UIView * view1 = [[UIView alloc] initWithFrame: CGRectMake (0, 0,320,300)];
View1.backgroundColor = [UIColor redColor];
[View addSubview: view1];
[View1 release];

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