IOS development app clipboard function tutorial (1)

IOSDevelop applicationsClipboardThis document describes the functional tutorials.IOS, You can useClipboardImplement data sharing among and between applications. For example, you can copy a url from iPhone QQ and paste it into the safari browser to view the link content.

1. In iOS, the following three controls have the copy-and-paste function:

1. UITextView

2. UITextField

3. UIWebView

Ii. UIKit framework provides several classes and protocols for us to implement the clipboard function in our own applications.

1. UIPasteboard: You can write data to or read data.

2. UIMenuController: displays a shortcut menu for copying, cutting, and pasting selected items.

3. can1_maction: withSender in UIResponder: used to control which commands are displayed in the shortcut menu.

4. When you click a command on the shortcut menu, UIResponderStandardEditActions will be called.

3. The following items can be placed in the clipboard.

1. UIPasteboardTypeListString-string array, which contains the kUTTypeUTF8PlainText

2. UIPasteboardTypeListURL-URL array, including

3. UIPasteboardTypeListImage-Image array, including the kUTTypePNG and kUTTypeJPEG

4. UIPasteboardTypeListColor-color array

4. There are two types of clipboard:

System Level: Use UIPasteboardNameGeneral and UIPasteboardNameFind to create a system level clipboard. data will not be lost when the application is closed or uninstalled.

Application-level: by setting, data can be stored in the clipboard after the application is closed, but the data will be lost after the application is uninstalled. We can use pasteboardWithName: create: To create an instance.

After learning about this, we will use a series of examples to illustrate how to use the clipboard in an application.

Example:

1. Copy the clipboard text.

In the following example, a shortcut menu is displayed on tableview, where only the copy button is displayed. copy the data on tableview and paste it to the title.

Define a cell class CopyTableViewCell. The shortcut menu is displayed on this class to implement the copy function.

 
 

  
  
@interface CopyTableViewCell : UITableViewCell {     
  
  
 id delegate;}@property (nonatomic, retain) id delegate;  
  
  
 @end 
 
 

Implement 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 
 
 

Define CopyPasteTextController to implement the paste function.

 
 

  
  
@ Interface CopyPasteTextController: UIViewController <UITableViewDelegate>
  
  
{
  
  
// Used to identify whether a shortcut menu is displayed
  
  
BOOL menuVisible;
  
  
UITableView * tableView;
  
  
}
  
  
@ Property (nonatomic, getter = isMenuVisible) BOOL menuVisible;
  
  
@ Property (nonatomic, retain) IBOutlet UITableView * tableView;
  
  
@ End
 
 

Implement CopyPasteTextController:

 
 

  
  
# Import "CopyPasteTextController. h"
  
  
# Import "CopyTableViewCell. h"
  
  
@ Implementation CopyPasteTextController
  
  
@ Synthesize menuVisible, tableView;
  
  
-(Void) viewDidLoad {
  
  
[Super viewDidLoad];
  
  
[Self setTitle: @ "copy and paste text"]; // click this button to paste the clipboard content to the title.
  
  
UIBarButtonItem * addButton = [[UIBarButtonItem alloc]
  
  
InitWithBarButtonSystemItem: UIBarButtonSystemItemRefresh
  
  
Target: self
  
  
Action: @ selector (readFromPasteboard :)]
  
  
Autorelease];
  
  
[[Self navigationItem] setRightBarButtonItem: addButton];
  
  
}
  
  
// Customize the number of functions 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];} // display menu-(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;
  
  
}
 
 

Effect:

Copy a row of data:

Click the paste button in the upper right corner to display the data on the title: