先看实现效果.
类代码:
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//
// AutocompletionTableView.h
//
// Created by Gushin Arseniy on 11.03.12.
// Copyright (c) 2012 Arseniy Gushin. All rights reserved.
//
#import <UIKit/UIKit.h>
// Consts for AutoCompleteOptions:
//
// if YES - suggestions will be picked for display case-sensitive
// if NO - case will be ignored
#define ACOCaseSensitive @"ACOCaseSensitive"
// if "nil" each cell will copy the font of the source UITextField
// if not "nil" given UIFont will be used
#define ACOUseSourceFont @"ACOUseSourceFont"
// if YES substrings in cells will be highlighted with bold as user types in
// *** FOR FUTURE USE ***
#define ACOHighlightSubstrWithBold @"ACOHighlightSubstrWithBold"
// if YES - suggestions view will be on top of the source UITextField
// if NO - it will be on the bottom
// *** FOR FUTURE USE ***
#define ACOShowSuggestionsOnTop @"ACOShowSuggestionsOnTop"
@protocol AutocompletionTableViewDelegate;
@interface AutocompletionTableView : UITableView <UITableViewDataSource, UITableViewDelegate>
// Dictionary of NSStrings of your auto-completion terms
@property (nonatomic, strong) NSArray *suggestionsDictionary;
// Dictionary of auto-completion options (check constants above)
@property (nonatomic, strong) NSDictionary *options;
//delegate
@property (nonatomic, assign) id<AutocompletionTableViewDelegate> tabDelegate;
// Call it for proper initialization
- (UITableView *)initWithTextField:(UITextField *)textField inViewController:(UIViewController *) parentViewController withOptions:(NSDictionary *)options;
@end
@protocol AutocompletionTableViewDelegate <NSObject>
- (void) autoCompletionTableView:(AutocompletionTableView *) completionView
deleteString:(NSString *) sString;
//点击序号
- (void) autoCompletionTableView:(AutocompletionTableView *) completionView
didSelectString:(NSString *) sString;
@end
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//
// AutocompletionTableView.m
//
// Created by Gushin Arseniy on 11.03.12.
// Copyright (c) 2012 Arseniy Gushin. All rights reserved.
//
#import "AutocompletionTableView.h"
#define TABLEVIEW_MAX_HEIGHT 120
@interface AutocompletionTableView ()
@property (nonatomic, strong) NSArray *suggestionOptions; // of selected NSStrings
@property (nonatomic, strong) UITextField *textField; // will set automatically as user enters text
@property (nonatomic, strong) UIFont *cellLabelFont; // will copy style from assigned textfield
- (void) resizingTableHeight;
@end
@implementation AutocompletionTableView
@synthesize suggestionsDictionary = _suggestionsDictionary;
@synthesize suggestionOptions = _suggestionOptions;
@synthesize textField = _textField;
@synthesize cellLabelFont = _cellLabelFont;
@synthesize options = _options;
@synthesize tabDelegate = _tabDelegate;
#pragma mark - Initialization
- (UITableView *)initWithTextField:(UITextField *)textField inViewController:(UIViewController *) parentViewController withOptions:(NSDictionary *)options
{
//set the options first
self.options = options;
CGRect frame;
// frame must align to the textfield
frame = CGRectMake(textField.frame.origin.x,
textField.frame.origin.y + textField.frame.size.height,
textField.frame.size.width,
TABLEVIEW_MAX_HEIGHT);
// save the font info to reuse in cells
self.cellLabelFont = textField.font;
self = [super initWithFrame:frame
style:UITableViewStylePlain];
self.delegate = self;
self.dataSource = self;
self.scrollEnabled = YES;
// turn off standard correction
textField.autocorrectionType = UITextAutocorrectionTypeNo;
// to get rid of "extra empty cell" on the bottom
// when there's only one cell in the table
UIView *v = [[UIView alloc] initWithFrame:CGRectMake(0, 0, textField.frame.size.width, 1)];
v.backgroundColor = [UIColor clearColor];
[self setTableFooterView:v];
self.hidden = YES;
//在uiview 下面
if (textField.superview.superview == nil) {
[parentViewController.view addSubview:self];
} else {
[textField.superview addSubview:self];
}
self.alpha = 0.85;
[textField addTarget:self action:@selector(textFieldValueChanged:) forControlEvents:UIControlEventEditingChanged];
[textField addTarget:self action:@selector(textFieldBeginEdit:) forControlEvents:UIControlEventEditingDidBegin];
[textField addTarget:self action:@selector(textFieldEndEdit:) forControlEvents:UIControlEventEditingDidEnd];
[textField addTarget:self action:@selector(textFieldDidEndOnExit:) forControlEvents:UIControlEventEditingDidEndOnExit];
return self;
}
- (void) resizingTableHeight {
NSInteger nCount = self.suggestionOptions.count;
CGRect frame = self.frame;
if (nCount * 44.0 < TABLEVIEW_MAX_HEIGHT) {
frame.size.height = nCount * 44.0;
} else {
frame.size.height = TABLEVIEW_MAX_HEIGHT;
}
self.frame = frame;
}
#pragma mark - Logic staff
- (BOOL) substringIsInDictionary:(NSString *)subString
{
NSMutableArray *tmpArray = [NSMutableArray array];
NSRange range;
for (NSString *tmpString in self.suggestionsDictionary)
{
range = ([[self.options valueForKey:ACOCaseSensitive] isEqualToNumber:[NSNumber numberWithInt:1]]) ? [tmpString rangeOfString:subString] : [tmpString rangeOfString:subString options:NSCaseInsensitiveSearch];
if (range.location != NSNotFound) [tmpArray addObject:tmpString];
}
if ([tmpArray count]>0)
{
self.suggestionOptions = tmpArray;
return YES;
}
return NO;
}
#pragma mark - Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.suggestionOptions.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *AutoCompleteRowIdentifier = @"AutoCompleteRowIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:AutoCompleteRowIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault reuseIdentifier:AutoCompleteRowIdentifier];
UIView *selectBackView = [[UIView alloc] initWithFrame:cell.frame];
selectBackView.backgroundColor = [UIColor colorWithRed:201.0 / 255.0
green:201.0 / 255.0
blue:201.0 / 255.0
alpha:1];
cell.selectedBackgroundView = selectBackView;
[selectBackView release];
// UIView *accView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];
// UIButton *button = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
// button.frame = CGRectMake(0, 0, 30, 30);
// [accView addSubview:button];
// cell.accessoryView = accView;
// [accView release];
cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
}
if ([self.options valueForKey:ACOUseSourceFont])
{
cell.textLabel.font = [self.options valueForKey:ACOUseSourceFont];
} else {
cell.textLabel.font = self.cellLabelFont;
}
cell.textLabel.adjustsFontSizeToFitWidth = NO;
cell.textLabel.text = [self.suggestionOptions objectAtIndex:indexPath.row];
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if (_tabDelegate &&
[_tabDelegate respondsToSelector:@selector(autoCompletionTableView:didSelectString:)]) {
[_tabDelegate autoCompletionTableView:self
didSelectString:[self.suggestionOptions objectAtIndex:indexPath.row]];
}
[self.textField setText:[self.suggestionOptions objectAtIndex:indexPath.row]];
[self hideOptionsView];
}
- (void) tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
if (_tabDelegate &&
[_tabDelegate respondsToSelector:@selector(autoCompletionTableView:deleteString:)]) {
[_tabDelegate autoCompletionTableView:self deleteString:[self.suggestionOptions objectAtIndex:indexPath.row]];
}
[self showOptionsView];
self.suggestionOptions = [NSMutableArray arrayWithArray:_suggestionsDictionary];
[self reloadData];
}
}
- (void) tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath {
[self tableView:tableView commitEditingStyle:UITableViewCellEditingStyleDelete forRowAtIndexPath:indexPath];
}
#pragma mark - UITextField delegate
- (void)textFieldValueChanged:(UITextField *)textField
{
self.textField = textField;
NSString *curString = textField.text;
if (![curString length])
{
[self textFieldBeginEdit:textField];
return;
} else if ([self substringIsInDictionary:curString]) {
[self reloadData];
[self showOptionsView];
} else {
[self hideOptionsView];
}
}
- (void) textFieldBeginEdit:(UITextField *) textField {
if ([textField.text length] == 0) {
self.suggestionOptions = [NSMutableArray arrayWithArray:_suggestionsDictionary];
[self reloadData];
[self showOptionsView];
}
}
- (void) textFieldEndEdit:(UITextView *) textField {
[self hideOptionsView];
}
- (void) textFieldDidEndOnExit:(UITextField *) textField {
[self hideOptionsView];
}
#pragma mark - Options view control
- (void)showOptionsView
{
[self resizingTableHeight];
self.hidden = NO;
}
- (void) hideOptionsView
{
self.hidden = YES;
}
@end
使用代码:
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- (AutocompletionTableView *)autoCompleter
{
if (!_autoCompleter)
{
NSMutableDictionary *options = [NSMutableDictionary dictionaryWithCapacity:2];
[options setValue:[NSNumber numberWithBool:YES] forKey:ACOCaseSensitive];
[options setValue:nil forKey:ACOUseSourceFont];
_autoCompleter = [[AutocompletionTableView alloc] initWithTextField:self.fieldUserName inViewController:self withOptions:options];
_autoCompleter.tabDelegate = self;
_autoCompleter.suggestionsDictionary = [CWDataBaseModel loginUserNames];
}
return _autoCompleter;
}