我从UITableViewCell创建了一个类，允许我编辑正确的详细文本。它使用UITextField作为editableAccessoryView。代码如下。
问题是我需要根据更改更新字符串。即编辑完成后，将使用textField.text字符串更新字符串。
在另一种语言中，我可能在UITableViewCell子类中有一个String指针，我将使用我想要更改的字符串的指针进行更新。但是虽然我可以使用import UIKit
class EditableRightDetailTableViewCell: UITableViewCell, UITextFieldDelegate {
enum TextFieldType {
case Text
case Numeric
}
var type = TextFieldType.Text
let textField = UITextField(frame: CGRectMake(150, 7, 200, 30))
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
textField.borderStyle = UITextBorderStyle.RoundedRect
textField.textAlignment = NSTextAlignment.Right
textField.clearButtonMode = UITextFieldViewMode.Always
textField.delegate = self
self.editingAccessoryView = textField
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
override func setEditing(editing: Bool, animated: Bool) {
if !self.editing && editing == true {
self.detailTextLabel?.hidden = true
textField.text = self.detailTextLabel?.text
}
else if self.editing && editing == false {
self.detailTextLabel?.hidden = false
self.detailTextLabel?.text = textField.text
}
super.setEditing(editing, animated: animated)
}
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
if type == TextFieldType.Numeric {
// We ignore any change that doesn't add characters to the text field.
// These changes are things like character deletions and cuts, as well
// as moving the insertion point.
//
// We still return true to allow the change to take place.
if count(string) == 0 {
return true
}
// Check to see if the text field's contents still fit the constraints
// with the new content added to it.
// If the contents still fit the constraints, allow the change
// by returning true; otherwise disallow the change by returning false.
let prospectiveText = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)
return prospectiveText.isNumeric() && count(prospectiveText) <= 11
}
return true
}
}
传递指向函数的指针，但我无法确定如何存储该指针。
有什么想法吗？
// Quick and dirty - error checks omitted for brevity.
#include <iostream>
#include <string>
#include <conio.h>
#include <WinSock2.h>
#include <ws2tcpip.h>
using namespace std;
void chat (int socket_d)
{
while (true)
{
if (_kbhit ())
{
char ch;
ch = _getche();
int n;
n = send (socket_d, &ch, 1, 0);
if (ch == '\r')
{
cout << "\n";
}
}
int n;
int count = 0;
char byte; // Read one byte at a time - is this efficient?
n = recv (socket_d, &byte, 1, 0);
if (n <= 0)
{
if (WSAGetLastError() != WSAEWOULDBLOCK) // A real problem - not just avoiding blocking.
{
cout << "Terminated " << WSAGetLastError() << "\n";
return;
}
}
else
{
cout << (char)byte;
if ((char) byte == '\r')
cout << "\n";
}
}
}
int main (int argc, char * argv [])
{
// Messy process with windows networking - "start" the networking API.
WSADATA wsaData;
int result = WSAStartup (MAKEWORD (2, 2), &wsaData);
unsigned short port = 25565;
// If argument is IP address - be a client and connect to it. Otherwise
// be a server.
if (argc > 1)
{
int socket_d;
socket_d = socket (AF_INET, SOCK_STREAM, 0);
// be a client.
struct sockaddr_in server_addr;
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = inet_addr (argv[1]); // Parse the string and create the 32 bit address.
server_addr.sin_port = htons (port); // Watch out for the endian conversion!
connect (socket_d, (sockaddr *) &server_addr, sizeof (server_addr));
u_long iMode=1;
ioctlsocket (socket_d, FIONBIO, &iMode); // put the socket into non-blocking mode.
chat (socket_d);
closesocket (socket_d);
}
else
{
// be a server
int listen_socket_d;
int connection_socket_d;
listen_socket_d = socket (AF_INET, SOCK_STREAM, 0);
struct sockaddr_in server_addr;
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = INADDR_ANY; // A placeholder that will be replaced with my own address.
server_addr.sin_port = htons (port); // Watch out for the endian conversion!
bind (listen_socket_d, (struct sockaddr *) &server_addr, sizeof (server_addr));
int backlog = 5;
listen (listen_socket_d, backlog);
// take only the first connection.
struct sockaddr_storage their_addr;
int their_addr_size = sizeof(their_addr);
connection_socket_d = accept (listen_socket_d, (struct sockaddr *) &their_addr, &their_addr_size);
u_long iMode=1;
ioctlsocket (connection_socket_d, FIONBIO, &iMode); // put the socket into non-blocking mode.
chat (connection_socket_d);
closesocket (connection_socket_d);
}
return 0;
}
答案 0 :(得分：1)
不良做法
你真的不想保留UITableViewCell中对象的指针。首先，它们通常由操作系统缓存，并按需加载，简而言之，您不应该尝试拥有它们，并且当然会保留指针。
良好做法
如果您的数据发生变化，请告诉UITableView重绘该单元格。您甚至可以重新绘制一个新的，不同的UITableViewCell。 （您甚至可以使用通知，将视图与模型进一步分离）
<强>夫特
self.tableView.beginUpdates()
let indexPath = NSIndexPath(forRow: row, inSection: section)
self.tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
self.tableView.endUpdates()
<强>的OBJ-C
[self.tableView beginUpdates];
NSIndexPath * indexPath = [NSIndexPath indexPathForRow:row inSection:section];
[self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView endUpdates];
答案 1 :(得分：0)
如果有人感兴趣，他就是我的实施：
可编辑的UITextViewCell。它应该在IB中设置为Right Detail。当表视图设置为编辑时，将出现UITextField。
import UIKit
class StringFieldDelegate: NSObject, UITextFieldDelegate {
var value: String
var valueChanged: Optional<() -> ()> = nil
func invokeValueChanged() {
self.valueChanged?()
}
init(value: String) {
self.value = value
}
func textFieldDidEndEditing(textField: UITextField) {
value = textField.text
invokeValueChanged()
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
value = textField.text
invokeValueChanged()
return true
}
}
这是代表。注意值更改变量。可以为其分配一个闭包，以便在更新值时运行
ViewController然后在var nameField: StringFieldDelegate!
我们创建像
viewDidLoad并在cell.textField.delegate = nameField
在单元格加载部分，我们可以设置单元格的委托
shouldChangeCharactersInRange现在，当单元格完成编辑或按下返回时，nameField将更新。 （对于即时更新，您必须实施invokeValueChanged并更新值并在其中触发nameField.valueChanged = { println(nameField.value) }
此外，您可以为值更改时分配闭包，例如
shouldChangeCharactersInRange委托可用于任何UITextField。如果您实施func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
if count(string) == 0 {
return true
}
let prospectiveText = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)
return prospectiveText.isNumeric()
}
，您可以执行以下操作：
extension String {
// Returns true if the string represents a proper numeric value.
// This method uses the device's current locale setting to determine
// which decimal separator it will accept.
func isNumeric() -> Bool
{
let scanner = NSScanner(string: self)
// A newly-created scanner has no locale by default.
// We'll set our scanner's locale to the user's locale
// so that it recognizes the decimal separator that
// the user expects (for example, in North America,
// "." is the decimal separator, while in many parts
// of Europe, "," is used).
scanner.locale = NSLocale.currentLocale()
return scanner.scanDecimal(nil) && scanner.atEnd
}
}
将使文本字段仅接受使用扩展名
的数字字符 $ch = curl_init();
curl_setopt($ch, CURLOPT_URL, env('PAYPAL_HOST_URL'));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
// curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
// curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
// curl_setopt($ch, CURLOPT_HTTPHEADER, array("Host: $pp_hostname"));
$res = curl_exec($ch);
curl_close($ch);
if(!$res){
//HTTP ERROR
} else {
// parse the data
$lines = explode("\n", $res);
$keyarray = array();
if (strcmp ($lines[0], "SUCCESS") == 0) {
for ($i=1; $i<count($lines);$i++) {
list($key,$val) = explode("=", $lines[$i]);
$keyarray[urldecode($key)] = urldecode($val);
}