一行代码为UITextField添加收键盘功能

iOS开发中收键盘是十分常用的功能，只需一行代码即可为ViewController添加工具条收键盘功能

更重要的是使用catogory，无代码污染。

代码

//  UITextField+keyboard.h
//  TextFieldKeyBord
//
//  Created by luo.h on 15/10/8.
//  Copyright  2015年 l.h. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UITextField (keyboard)

+(void)registerTextFieldInView:(UIView *)aView;

@end

//
//  UITextField+keyboard.m
//  TextFieldKeyBord
//
//  Created by luo.h on 15/10/8.
//  Copyright  2015年 l.h. All rights reserved.
//

#import "UITextField+keyboard.h"

@implementation UITextField (keyboard)

-(void)addToolbarWitDoneTitle:(NSString*)title
{
    UIBarButtonItem *flexibleSpaceLeft = [[UIBarButtonItem alloc]
                                          initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
                                          target:nil
                                          action:nil];

    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:title
                                                                   style:UIBarButtonItemStyleDone
                                                                  target:self
                                                                  action:@selector(dismissKeyBord)];
    [doneButton  setTintColor:[UIColor redColor]];

    UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, self.window.frame.size.width, 44.0)];
    [toolbar setItems:@[flexibleSpaceLeft, doneButton]];
    [self setInputAccessoryView:toolbar];
}
//查找所有UITextField并添加按钮
+(void)registerTextFieldInView:(UIView *)aView;
{
    for (id obj in aView.subviews) {
        NSLog(@"obj class: %@",[obj class]);
        if ([obj isKindOfClass:[UITextField class]]) {
            UITextField* theTextField = (UITextField*)obj;
            [theTextField addToolbarWitDoneTitle:@"完成"];

        }
    }
}

-(void)dismissKeyBord
{
    [self  resignFirstResponder];
}

@end

使用：

- (void)viewDidLoad {
    [super viewDidLoad];

    //注册self.view里所有UITextField
    [UITextField registerTextFieldInView:self.view];

}

Demo:　https://files.cnblogs.com/files/sixindev/TextFieldKeyBord.zip