textfield for ios - objective-c

Question

i am very new to iOS and xcode. i want to create a textfield without using nib files or storyboard. i searched for the answers but everywhere its kind of confusing or they have used nib files. i have created buttons and its working fine but for textfields m facing problems. here is my viewcontroller.m please help.
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)loadView {
self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
self.view.backgroundColor = [UIColor purpleColor];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
UITextField *textfield;
button.frame = CGRectMake(10 ,350 , 300, 40);
button1.frame = CGRectMake(10 ,50 , 300, 40);
textfield.frame = CGRectMake(10, 100, 200, 30);
[button setTitle:#"Change screen to green!" forState:UIControlStateNormal];
[button1 setTitle:#"click screen to red!" forState:UIControlStateNormal];
[button addTarget:self action:#selector(buttonPressed) forControlEvents:UIControlEventTouchUpInside];
[button1 addTarget:self action:#selector(buttonPressed1) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
[self.view addSubview:button1];
[self.view addSubview:textfield];
}
-(void)buttonPressed {
self.view.backgroundColor = [UIColor greenColor];
}
-(void)buttonPressed1 {
self.view.backgroundColor = [UIColor redColor];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
#end
thanks & regards

Answer 1

You just declared the UITextField instead of allocating. You must allocate it first then set frame & add it on the view like -
UITextField *txt = [[UITextField alloc] init];
txt.frame = CGRectMake(10, 100, 200, 30);
txt.delegate = self;
[self.view adsubview:txt];
It solves your problem.

Answer 2

First use
UITextField *textfield = [[UITextField alloc] init];
instead of
UITextField *textfield;
Then set backgroud color of textfield since the backgroud color will be clearColor by default.
textfield.backgroundColor = [UIColor whiteColor];
or use
textfield.borderStyle = UITextBorderStyleRoundedRect;
to get white colored bordered text field.

Answer 3

If you've added the alloc init like the answers have suggested, your text field is in fact on the screen, but since it has no border or no text, you can't see it. Try adding this line, and then you will see it:
textfield.borderStyle = UITextBorderStyleRoundedRect;

Answer 4

Use this:
UITextField *textfield = [[UITextField alloc] init];
Insetd of
UITextField *textfield;
UITextField *textfield; Just crete object reference Not object.

Answer 5

UITextField *textfield =[[UITextField alloc] init];
textfield.frame = CGRectMake(10, 100, 200, 30);
textfield.delegate = self; [self.view addSubview:textfield];
[self.view bringSubViewToFront:textfield];
may solve the problem