ios开发-inputView和inputAccessoryView

说明

在UITextField和UITextField中能查到这两个属性

@property (readwrite, retain) UIView *inputView;

@property (readwrite, retain) UIView *inputAccessoryView;

在UITextField或者UITextField成为默认响应的时候，会弹出系统键盘。如果对这两个控件的inputView属性设置了自定义的view，在其成为第一响应的时候系统键盘将不再弹出，取而代之的是赋值给inputView的那个view。inputAccessoryView是键盘的辅助视图，即键盘上面那部分。同样当对inputAccessoryView设置了自定义view时，键盘弹出的同时，该view会作为辅助视图出现在键盘的上面，和键盘一起弹出。通常会使用pickerView作为自定义的弹出视图，这里为了简单起见，用一个普通的view演示：

基础代码演示

#import "ViewController.h"#define SCREEN_BOUNDS [UIScreen mainScreen].bounds@interface ViewController ()@property (nonatomic, strong) UITextField *textField;@property (nonatomic, strong) UIView *customInputView;  @property (nonatomic, strong) UIToolbar *customAccessoryView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    [self loadBaseUI];}- (void)loadBaseUI{    [self.view addSubview:self.textField];}- (UITextField *)textField{    if (!_textField) {        _textField = [[UITextField alloc]initWithFrame:CGRectMake(50, 100, SCREEN_BOUNDS.size.width - 100, 30)];        _textField.layer.borderWidth = 1.0;        _textField.layer.borderColor = [UIColor lightGrayColor].CGColor;        _textField.layer.cornerRadius = 4.0;        _textField.placeholder = @"测试";        _textField.inputView = self.customInputView;        _textField.inputAccessoryView = self.customAccessoryView;    }    return _textField;}- (UIView *)customInputView{    if (!_customInputView) {        _customInputView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_BOUNDS.size.width, 220)];        _customInputView.backgroundColor = [UIColor lightGrayColor];        UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 100, SCREEN_BOUNDS.size.width, 40)];        label.textAlignment = NSTextAlignmentCenter;        label.text = @"自定义inputView";        [_customInputView addSubview:label];    }    return _customInputView;}- (UIToolbar *)customAccessoryView{    if (!_customAccessoryView) {        _customAccessoryView = [[UIToolbar alloc]initWithFrame:(CGRect){0,0,SCREEN_BOUNDS.size.width,40}];        _customAccessoryView.barTintColor = [UIColor orangeColor];        UIBarButtonItem *space = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];        UIBarButtonItem *finish = [[UIBarButtonItem alloc]initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:self action:@selector(done)];        [_customAccessoryView setItems:@[space,space,finish]];    }    return _customAccessoryView;}- (void)done{    [self.textField resignFirstResponder];}@end

点击textField后的显示效果

对其他控件设置inputView和inputAccessoryView

除了UITextField和UITextField，有事我们可能想让别的控件实现类似效果，比如点击一个按钮、选中某个cell的时候弹出键盘，但是对于UITextField和UITextField以外的控件，inputView和inputAccessoryView是只读的

@property (nonatomic, readonly, retain) UIView *inputView

@property (nonatomic, readonly, retain) UIView *inputAccessoryView

因此如果要使用控件这两个属性，就要创建该控件的子视图，然后重新申明inputView和inputAccessoryView为readwrite的，并重写它们的get方法，这样在UITableViewCell成为第一响应的时候会自动弹出inputView和inputAccessoryView。以UITableView演示：

代码示例

//MyTableViewCell.h#import <UIKit/UIKit.h>#define SCREEN_BOUNDS [UIScreen mainScreen].bounds@interface MyTableViewCell : UITableViewCell//属性申明为可读写@property (nonatomic, strong, readwrite) UIView *inputView;@property (nonatomic, strong, readwrite) UIToolbar *inputAccessoryView;@end

//  MyTableViewCell.m#import "MyTableViewCell.h"@implementation MyTableViewCell//重写get方法- (UIView *)inputView{    if (!_inputView) {        _inputView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_BOUNDS.size.width, 220)];        _inputView.backgroundColor = [UIColor lightGrayColor];        UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 100, SCREEN_BOUNDS.size.width, 40)];        label.textAlignment = NSTextAlignmentCenter;        label.text = @"自定义inputView";        [_inputView addSubview:label];    }    return _inputView;}- (UIToolbar *)inputAccessoryView{    if (!_inputAccessoryView) {        _inputAccessoryView = [[UIToolbar alloc]initWithFrame:(CGRect){0,0,SCREEN_BOUNDS.size.width,40}];        _inputAccessoryView.barTintColor = [UIColor orangeColor];        UIBarButtonItem *space = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];        UIBarButtonItem *finish = [[UIBarButtonItem alloc]initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:self action:@selector(done)];        [_inputAccessoryView setItems:@[space,space,finish]];    }    return _inputAccessoryView;}- (void)done{    [self resignFirstResponder];}@end

在主视图控制器中创建一个tableView发现这样之后点击cell发现不会弹出inputView，最后查阅官方文档发现需要在子类中重写canBecomeFirstResponder方法：
在子类.m文件中添加

- (BOOL)canBecomeFirstResponder{    return YES;}

发现还是不行，最后手动becomeFirstResponder，终于实现了。PS原来选中都还不算是成为第一响应，坑爹啊！

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    MyTableViewCell *cell = (MyTableViewCell *)[tableView cellForRowAtIndexPath:indexPath];    [cell becomeFirstResponder];}

效果图