ios開發-inputView和inputAccessoryView

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說明

在UITextField和UITextField中能查到這兩個屬性

@property (readwrite, retain) UIView *inputView;

@property (readwrite, retain) UIView *inputAccessoryView;

在UITextField或者UITextField成為預設響應的時候，會彈出系統鍵盤。如果對這兩個控制項的inputView屬性設定了自訂的view，在其成為第一響應的時候系統鍵盤將不再彈出，取而代之的是賦值給inputView的那個view。inputAccessoryView是鍵盤的輔助視圖，即鍵盤上面那部分。同樣當對inputAccessoryView設定了自訂view時，鍵盤彈出的同時，該view會作為輔助視圖出現在鍵盤的上面，和鍵盤一起彈出。通常會使用pickerView作為自訂的彈出視圖，這裡為了簡單起見，用一個普通的view示範：

基礎代碼示範

#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 = @"測試";        _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 = @"自訂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

點擊textField後的顯示效果

對其他控制項設定inputView和inputAccessoryView

除了UITextField和UITextField，有事我們可能想讓別的控制項實作類別似效果，比如點擊一個按鈕、選中某個cell的時候彈出鍵盤，但是對於UITextField和UITextField以外的控制項，inputView和inputAccessoryView是唯讀

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

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

因此如果要使用控制項這兩個屬性，就要建立該控制項的子視圖，然後重新申明inputView和inputAccessoryView為readwrite的，並重寫它們的get方法，這樣在UITableViewCell成為第一響應的時候會自動彈出inputView和inputAccessoryView。以UITableView示範：

程式碼範例

//MyTableViewCell.h#import <UIKit/UIKit.h>#define SCREEN_BOUNDS [UIScreen mainScreen].bounds@interface MyTableViewCell : UITableViewCell//屬性申明為可讀寫@property (nonatomic, strong, readwrite) UIView *inputView;@property (nonatomic, strong, readwrite) UIToolbar *inputAccessoryView;@end

//  MyTableViewCell.m#import "MyTableViewCell.h"@implementation MyTableViewCell//重寫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 = @"自訂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

在主視圖控制器中建立一個tableView發現這樣之後點擊cell發現不會彈出inputView，最後查閱官方文檔發現需要在子類中重寫canBecomeFirstResponder方法：
在子類.m檔案中添加

- (BOOL)canBecomeFirstResponder{    return YES;}

發現還是不行，最後手動becomeFirstResponder，終於實現了。PS原來選中都還不算是成為第一響應，坑爹啊！

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

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ios開發-inputView和inputAccessoryView