iOS開發(fā)應用剪貼板功能教程
iOS開發(fā)應用剪貼板功能教程是本文要介紹的內(nèi)容，在iOS中，可以使用剪貼板實現(xiàn)應用程序之中以及應用程序之間實現(xiàn)數(shù)據(jù)的共享。比如你可以從iPhone QQ復制一個url，然后粘貼到safari瀏覽器中查看這個鏈接的內(nèi)容。
一、在iOS中下面三個控件，自身就有復制-粘貼的功能：
1、UITextView
2、UITextField
3、UIWebView
二、UIKit framework提供了幾個類和協(xié)議方便我們在自己的應用程序中實現(xiàn)剪貼板的功能。
1、UIPasteboard：我們可以向其中寫入數(shù)據(jù)，也可以讀取數(shù)據(jù)
2、UIMenuController：顯示一個快捷菜單，用來復制、剪貼、粘貼選擇的項。
3、UIResponder中的 canPerformAction:withSender:用于控制哪些命令顯示在快捷菜單中。
4、當快捷菜單上的命令點擊的時候，UIResponderStandardEditActions將會被調(diào)用。
三、下面這些項能被放置到剪貼板中
1、UIPasteboardTypeListString — 字符串數(shù)組, 包含kUTTypeUTF8PlainText
2、UIPasteboardTypeListURL — URL數(shù)組，包含kUTTypeURL
3、UIPasteboardTypeListImage — 圖形數(shù)組, 包含kUTTypePNG 和kUTTypeJPEG
4、UIPasteboardTypeListColor — 顏色數(shù)組
四、剪貼板的類型分為兩種：
系統(tǒng)級：使用UIPasteboardNameGeneral和UIPasteboardNameFind創(chuàng)建，系統(tǒng)級的剪貼板，當應用程序關(guān)閉，或者卸載時，數(shù)據(jù)都不會丟失。
應用程序級：通過設置，可以讓數(shù)據(jù)在應用程序關(guān)閉之后仍然保存在剪貼板中，但是應用程序卸載之后數(shù)據(jù)就會失去。我們可用通過pasteboardWithName:create：來創(chuàng)建。
了解這些之后，下面通過一系列的例子來說明如何在應用程序中使用剪貼板。
例子：
1、復制剪貼文本。
下面通過一個例子，可以在tableview上顯示一個快捷菜單，上面只有復制按鈕，復制tableview上的數(shù)據(jù)之后，然后粘貼到title上。
定義一個單元格類CopyTableViewCell，在這個類的上顯示快捷菜單，實現(xiàn)復制功能。
- @interface CopyTableViewCell : UITableViewCell {
- id delegate;}@property (nonatomic, retain) id delegate;
- @end
實現(xiàn)CopyTableViewCell ：
- #import "CopyTableViewCell.h"@implementation CopyTableViewCell@synthesize delegate;
- - (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
- {
- if ((self = [super initWithStyle:style reuseIdentifier:reuseIdentifier])) { }
- return self;
- }
- - (void)setSelected:(BOOL)selected animated:(BOOL)animated {
- [super setSelected:selected animated:animated];
- }
- - (void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated {
- [[self delegate] performSelector:@selector(showMenu:)
- withObject:self afterDelay:0.9f];
- [super setHighlighted:highlighted animated:animated];
- }
- - (BOOL)canBecomeFirstResponder {
- return YES;
- }
- - (BOOL)canPerformAction:(SEL)action withSender:(id)sender{
- if (action == @selector(cut:)){
- return NO;
- } else if(action == @selector(copy:)){
- return YES;
- }
- else if(action == @selector(paste:)){
- return NO;
- }
- else if(action == @selector(select:)){
- return NO;
- }
- else if(action == @selector(selectAll:)){
- return NO;
- } else {
- return [super canPerformAction:action withSender:sender];
- }
- }
- - (void)copy:(id)sender {
- UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
- [pasteboard setString:[[self textLabel]text]];
- }
- - (void)dealloc {
- [super dealloc];
- }
- @end
定義CopyPasteTextController，實現(xiàn)粘貼功能。
- @interface CopyPasteTextController : UIViewController<UITableViewDelegate>
- {
- //用來標識是否顯示快捷菜單
- BOOL menuVisible;
- UITableView *tableView;
- }
- @property (nonatomic, getter=isMenuVisible) BOOL menuVisible;
- @property (nonatomic, retain) IBOutlet UITableView *tableView;
- @end
實現(xiàn)CopyPasteTextController ：
- #import "CopyPasteTextController.h"
- #import "CopyTableViewCell.h"
- @implementation CopyPasteTextController
- @synthesize menuVisible,tableView;
- - (void)viewDidLoad {
- [super viewDidLoad];
- [self setTitle:@"文字復制粘貼"]; //點擊這個按鈕將剪貼板的內(nèi)容粘貼到title上
- UIBarButtonItem *addButton = [[[UIBarButtonItem alloc]
- initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
- target:self
- action:@selector(readFromPasteboard:)]
- autorelease];
- [[self navigationItem] setRightBarButtonItem:addButton];
- }
- // Customize the number of sections in the table view.
- - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
- return 1;
- }
- - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
- return 9;}// Customize the appearance of table view cells.
- - (UITableViewCell *)tableView:(UITableView *)tableView
- cellForRowAtIndexPath:(NSIndexPath *)indexPath{
- static NSString *CellIdentifier =@"Cell";
- CopyTableViewCell *cell = (CopyTableViewCell *)
- [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
- if (cell == nil) {
- cell = [[[CopyTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
- [cell setDelegate:self];
- }
- // Configure the cell.
- NSString *text = [NSString stringWithFormat:@"Row %d", [indexPath row]];
- [[cell textLabel] setText:text];
- return cell;
- }
- - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
- if([self isMenuVisible]) {
- return;
- }
- [[[self tableView] cellForRowAtIndexPath:indexPath] setSelected:YES
- animated:YES];}//顯示菜單- (void)showMenu:(id)cell {
- if ([cell isHighlighted]) {
- [cell becomeFirstResponder];
- UIMenuController * menu = [UIMenuController sharedMenuController];
- [menu setTargetRect: [cell frame] inView: [self view]];
- [menu setMenuVisible: YES animated: YES];
- }
- }
- - (void)readFromPasteboard:(id)sender {
- [self setTitle:[NSString stringWithFormat:@"Pasteboard = %@",[[UIPasteboard generalPasteboard] string]]];
- }
- - (void)didReceiveMemoryWarning{
- // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning];
- // Relinquish ownership any cached data, images, etc that aren't in use.
- }
- - (void)viewDidUnload{
- [super viewDidUnload];
- [self.tableView release];
- // Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
- // For example: self.myOutlet = nil;
- }
效果：
復制一行數(shù)據(jù)：
點擊右上角的按鈕粘貼，將數(shù)據(jù)顯示在title上：
#p#
2、圖片復制粘貼
下面通過一個例子，將圖片復制和剪貼到另外一個UIImageView中間。
1、在界面上放置兩個uiimageview，一個是圖片的數(shù)據(jù)源，一個是將圖片粘貼到的地方。CopyPasteImageViewController 代碼如下：
- @interface CopyPasteImageViewController : UIViewController {
- UIImageView *imageView;
- UIImageView *pasteView;
- UIImageView *selectedView;
- }@property (nonatomic, retain) IBOutlet UIImageView *imageView;
- @property (nonatomic, retain) IBOutlet UIImageView *pasteView;
- @property (nonatomic, retain) UIImageView *selectedView;
- - (void)placeImageOnPasteboard:(id)view;
- @end
2、當觸摸圖片的時候我們顯示快捷菜單：
- - (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
- NSSet *copyTouches = [event touchesForView:imageView];
- NSSet *pasteTouches = [event touchesForView:pasteView];
- [self becomeFirstResponder];
- if ([copyTouches count] > 0) {
- [self performSelector:@selector(showMenu:)
- withObject:imageView afterDelay:0.9f];
- }
- else if([pasteTouches count] > 0) {
- [self performSelector:@selector(showMenu:)
- withObject:pasteView afterDelay:0.9f];
- }
- [super touchesBegan:touches withEvent:event];
- }
- - (void)showMenu:(id)view {
- [self setSelectedView:view];
- UIMenuController * menu = [UIMenuController sharedMenuController];
- [menu setTargetRect: CGRectMake(5, 10, 1, 1) inView: view];
- [menu setMenuVisible: YES animated: YES];}
這里的快捷菜單，顯示三個菜單項：剪貼、粘貼、復制：
- - (BOOL)canPerformAction:(SEL)action withSender:(id)sender{
- if (action == @selector(cut:)) {
- return ([self selectedView] == imageView) ? YES : NO;
- } else if (action == @selector(copy:)) {
- return ([self selectedView] == imageView) ? YES : NO;
- } else if (action == @selector(paste:)) {
- return ([self selectedView] == pasteView) ? YES : NO;
- } else if (action == @selector(select:)) {
- return NO;
- } else if (action == @selector(selectAll:)) {
- return NO;
- } else {
- return [super canPerformAction:action withSender:sender];
- }
- }
- - (void)cut:(id)sender {
- [self copy:sender];
- [imageView setHidden:YES];
- }
- - (void)copy:(id)sender {
- [self placeImageOnPasteboard:[self imageView]];
- }
- - (void)paste:(id)sender {
- UIPasteboard *appPasteBoard =[UIPasteboard pasteboardWithName:@"CopyPasteImage" create:YES];
- NSData *data =[appPasteBoard dataForPasteboardType:@"com.marizack.CopyPasteImage.imageView"];
- pasteView.image = [UIImage imageWithData:data];
- }
效果：
1、點擊圖片，顯示菜單按鈕。
2、點擊復制，將數(shù)據(jù)復制到剪貼板上：
3、點擊粘貼，將數(shù)據(jù)粘貼到uiimageview上。
小結(jié)：iOS開發(fā)應用剪貼板功能教程的內(nèi)容介紹完了，希望通過本文的學習對你有所幫助！
