iOS学习-UITextField代理

  1 //
  2 //  ViewController.m
  3 //  UITextField代理
  4 //
  5 //  Created by 大欢 on 16/1/22.
  6 //  Copyright © 2016年 bjsxt. All rights reserved.
  7 //
  8
  9 #import "ViewController.h"
 10
 11 @interface ViewController ()<UITextFieldDelegate>
 12
 13 @property (nonatomic, strong) UITextField * userTF;
 14
 15 @property (nonatomic, strong) UITextField * pwdTF;
 16
 17 @end
 18
 19 @implementation ViewController
 20
 21 - (void)viewDidLoad {
 22     [super viewDidLoad];
 23
 24     UITextField * userTextField = [[UITextField alloc] initWithFrame:CGRectMake(20, 50, CGRectGetWidth(self.view.frame) - 40, 50)];
 25     userTextField.placeholder = @"请输入用户名";
 26     userTextField.borderStyle = UITextBorderStyleRoundedRect;
 27     userTextField.delegate = self;
 28     userTextField.clearButtonMode = UITextFieldViewModeAlways;
 29     userTextField.returnKeyType = UIReturnKeyNext;
 30     [self.view addSubview:userTextField];
 31     self.userTF = userTextField;
 32
 33     UITextField * pwdTextField = [[UITextField alloc] initWithFrame:CGRectMake(20, CGRectGetMaxY(userTextField.frame) + 20, CGRectGetWidth(self.view.frame) - 40, 50)];
 34     pwdTextField.placeholder = @"请输入密码";
 35     pwdTextField.borderStyle = UITextBorderStyleRoundedRect;
 36     pwdTextField.delegate = self;
 37     pwdTextField.returnKeyType = UIReturnKeyGo;
 38     [self.view addSubview:pwdTextField];
 39     self.pwdTF = pwdTextField;
 40
 41     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidBeginEditingNotification:) name:UITextFieldTextDidBeginEditingNotification object:nil];
 42     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidEndEditingNotification:) name:UITextFieldTextDidEndEditingNotification object:nil];
 43     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidChangeNotification:) name:UITextFieldTextDidChangeNotification object:nil];
 44
 45 }
 46
 47 - (void)textDidBeginEditingNotification:(NSNotification *)notifi {
 48     NSLog(@"开始");
 49 }
 50
 51 - (void)textDidEndEditingNotification:(NSNotification *)notifi {
 52     NSLog(@"结束");
 53 }
 54
 55 - (void)textDidChangeNotification:(NSNotification *)notifi {
 56
 57     UITextField * tf = notifi.object;
 58     NSLog(@"%@",tf.text);
 59 }
 60
 61 //是否可以开始编辑
 62
 63 - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
 64
 65     return YES;
 66 }
 67
 68 //是否可以结束编辑
 69
 70 //- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
 71 //
 72 //    return YES;
 73 //}
 74 //
 75 //- (void)textFieldDidBeginEditing:(UITextField *)textField {
 76 //
 77 //    NSLog(@"已经开始");
 78 //}
 79 //
 80 //- (void)textFieldDidEndEditing:(UITextField *)textField {
 81 //
 82 //    NSLog(@"已经结束");
 83 //}
 84 //
 85 //- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
 86 //
 87 //    if (range.location > 2) return NO;
 88 //
 89 //    NSLog(@"%@",NSStringFromRange(range));
 90 //
 91 //    NSLog(@"%@",string);
 92 //
 93 //
 94 //    return YES;
 95 //}
 96
 97 //clearbutton 如果是NO不好使
 98
 99 //- (BOOL)textFieldShouldClear:(UITextField *)textField {
100 //
101 //    return NO;
102 //}
103
104
105 - (BOOL)textFieldShouldReturn:(UITextField *)textField {
106
107     if (self.userTF == textField) {
108         [self.pwdTF becomeFirstResponder];
109     } else if (self.pwdTF == textField) {
110         [self.pwdTF resignFirstResponder];
111     }
112
113     return YES;
114 }
115
116
117
118 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
119
120     [self.userTF resignFirstResponder];
121
122     [self.pwdTF resignFirstResponder];
123
124 }
125
126
127 @end