iOS学习-UITextField代理

//
//  ViewController.m
//  UITextField代理
//
//  Created by 大欢 on 16/1/22.
//  Copyright © 2016年 bjsxt. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()<UITextFieldDelegate>

@property (nonatomic, strong) UITextField * userTF;

@property (nonatomic, strong) UITextField * pwdTF;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UITextField * userTextField = [[UITextField alloc] initWithFrame:CGRectMake(20, 50, CGRectGetWidth(self.view.frame) - 40, 50)];
    userTextField.placeholder = @"请输入用户名";
    userTextField.borderStyle = UITextBorderStyleRoundedRect;
    userTextField.delegate = self;
    userTextField.clearButtonMode = UITextFieldViewModeAlways;
    userTextField.returnKeyType = UIReturnKeyNext;
    [self.view addSubview:userTextField];
    self.userTF = userTextField;
    
    UITextField * pwdTextField = [[UITextField alloc] initWithFrame:CGRectMake(20, CGRectGetMaxY(userTextField.frame) + 20, CGRectGetWidth(self.view.frame) - 40, 50)];
    pwdTextField.placeholder = @"请输入密码";
    pwdTextField.borderStyle = UITextBorderStyleRoundedRect;
    pwdTextField.delegate = self;
    pwdTextField.returnKeyType = UIReturnKeyGo;
    [self.view addSubview:pwdTextField];
    self.pwdTF = pwdTextField;
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidBeginEditingNotification:) name:UITextFieldTextDidBeginEditingNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidEndEditingNotification:) name:UITextFieldTextDidEndEditingNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidChangeNotification:) name:UITextFieldTextDidChangeNotification object:nil];
    
}

- (void)textDidBeginEditingNotification:(NSNotification *)notifi {
    NSLog(@"开始");
}

- (void)textDidEndEditingNotification:(NSNotification *)notifi {
    NSLog(@"结束");
}

- (void)textDidChangeNotification:(NSNotification *)notifi {
    
    UITextField * tf = notifi.object;
    NSLog(@"%@",tf.text);
}

//是否可以开始编辑

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    
    return YES;
}

//是否可以结束编辑

//- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
//    
//    return YES;
//}
//
//- (void)textFieldDidBeginEditing:(UITextField *)textField {
//    
//    NSLog(@"已经开始");
//}
//
//- (void)textFieldDidEndEditing:(UITextField *)textField {
//    
//    NSLog(@"已经结束");
//}
//
//- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
//    
//    if (range.location > 2) return NO;
//    
//    NSLog(@"%@",NSStringFromRange(range));
//    
//    NSLog(@"%@",string);
//    
//    
//    return YES;
//}

//clearbutton 如果是NO不好使

//- (BOOL)textFieldShouldClear:(UITextField *)textField {
//    
//    return NO;
//}


- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    
    if (self.userTF == textField) {
        [self.pwdTF becomeFirstResponder];
    } else if (self.pwdTF == textField) {
        [self.pwdTF resignFirstResponder];
    }
    
    return YES;
}



- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    
    [self.userTF resignFirstResponder];
    
    [self.pwdTF resignFirstResponder];
    
}


@end