Objective-C --- - UITextField(梳理总结)

//省的下面打  先定义好来

#define kWidthOfScreen ([UIScreen mainScreen].bounds.size.width)

#define kHeightOfScreen ([UIScreen mainScreen].bounds.size.height)

 

@interface ViewController ()<UITextFieldDelegate>／／遵照协议

{

    UITextField *tf ;

}

@end

 

- (void)viewDidLoad {

    [super viewDidLoad];

//    建立方式

    tf = [[UITextField alloc]init];

//    设置背景颜色

//    tf.backgroundColor = [UIColor redColor];

//    tf.background（背景图片）

    

//    添加到view上

    [self.view addSubview:tf];

    

//    设置frame

    tf.frame = CGRectMake(10, kHeightOfScreen - 30, kWidthOfScreen - 20, 30);

    

    

//    typedef NS_ENUM(NSInteger, UITextBorderStyle) {

//        UITextBorderStyleNone,

//        UITextBorderStyleLine,

//        UITextBorderStyleBezel,

//        UITextBorderStyleRoundedRect

//    };

//    

//    typedef NS_ENUM(NSInteger, UITextFieldViewMode) {

//        UITextFieldViewModeNever,

//        UITextFieldViewModeWhileEditing,

//        UITextFieldViewModeUnlessEditing,

//        UITextFieldViewModeAlways

//    };

 

    tf.borderStyle =  UITextBorderStyleRoundedRect;

 

    tf.clearButtonMode = UITextFieldViewModeAlways;

    

    

//    tf.clearsOnBeginEditing = YES;

 

//    设置第一响应者

   [tf becomeFirstResponder];

    

//    取消第一响应者

//    [tf resignFirstResponder];

    

    

    tf.placeholder = @"placeholder";

//    tf.attributedPlaceholder

    

//    设置代理为self

    tf.delegate = self;

    

//    设置键盘样式 （枚举）

    tf.keyboardType = UIKeyboardTypeDefault;

//    设置键盘右下角的文字（枚举）

    tf.returnKeyType = UIReturnKeySend;

 

//    设置安全输入

//    tf.secureTextEntry = YES;

    

//    设置左右两边的view

//    tf.leftView

//    tf.leftViewMode

//    tf.rightView

//    tf.rightViewMode

   

    

//    添加通知  监听键盘 show－hide

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(show:) name:UIKeyboardDidShowNotification object:nil];

    

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(hide:) name:UIKeyboardDidHideNotification object:nil];

    

}

-(void)dealloc{

    //    移除通知

    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidShowNotification object:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidHideNotification object:nil];

    

}

-(void)show:(NSNotification*)noti{

    CGRect keyboardFrame = [[noti.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

   CGRect tfFrame = tf.frame;

    tfFrame.origin.y -= keyboardFrame.size.height;

    

    tf.frame = tfFrame;

    

}

-(void)hide:(NSNotification*)noti{

    tf.frame = CGRectMake(10, kHeightOfScreen - 30, kWidthOfScreen - 20, 30);

}

 

//下面是经常使用的代理方法

 

-(BOOL)textFieldShouldClear:(UITextField *)textField{

    return YES;

}

-(BOOL)textFieldShouldReturn:(UITextField *)textField{

    [textField endEditing:YES];

    return YES;

}

-(void)textFieldDidEndEditing:(UITextField *)textField{

    NSLog(@"end");

}

-(void)textFieldDidBeginEditing:(UITextField *)textField{

    NSLog(@"begin");

}

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{

    NSLog(@"%@",string);

    return YES;

}

附模拟器键盘弹不起的解决方案

将下图中第三个没有勾上的打勾