我是 iPhone 开发新手。此代码用于将 UITextField 中的数据保存到 coredata(Vendor)，并使用 UIPicker 设置货币 UITextField(currencyArray 是 picker 的内容) .但是我在输入时看不到UITextField，因为键盘隐藏了UITextField。
@implementation DetailViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.currencyArray =[[NSArray alloc]initWithObjects:@"$",@"INR",@"EURO" ,nil];
self.contactPersonTextField.frame = CGRectMake(20, 308, 280, 30);
self.contactPersonNumberTextField.frame = CGRectMake(20, 341, 280, 30);
self.mobileNumberTextField.frame = CGRectMake(20, 374, 280, 30);
self.faxNumberTextField.frame = CGRectMake(20, 407, 280, 30);
self.emailTextField.frame = CGRectMake(20, 440, 280, 30);
self.remarksTextField.frame = CGRectMake(20, 473, 280, 30);
self.statusTextField.frame = CGRectMake(20, 506, 280, 30);
self.paymentTermsDateTextField.frame = CGRectMake(20, 539, 280, 30);
self.serialNoTextField.delegate = self;
self.vendorCodeTextField.delegate = self;
self.vendorNameTextField.delegate = self;
self.groupTextField.delegate = self;
self.currencyTextField.delegate = self;
self.accountBalanceTextField.delegate = self;
self.dateOfCreationTextField.delegate = self;
self.telephone1Textfield.delegate = self;
self.telephone2TextField.delegate = self;
self.contactPersonTextField.delegate = self;
self.contactPersonNumberTextField.delegate = self;
self.mobileNumberTextField.delegate = self;
self.faxNumberTextField.delegate = self;
self.emailTextField.delegate = self;
self.remarksTextField.delegate = self;
self.statusTextField.delegate = self;
self.paymentTermsDateTextField.delegate = self;
//setting frame for text field in scroll view
AppDelegate* appDelegate = [UIApplication sharedApplication].delegate;
self.managedObjectContext2 = appDelegate.managedObjectContext;
[self.scrollView setContentSize:CGSizeMake(self.view.frame.size.width,600)];
//[self.serialNoTextField setPlaceholder:[self.textfieldArray objectAtIndex:0]];
/* if ([[self.textfieldArray objectAtIndex:0] isEqualToString:@"Vendor Code"]) {
appDelegate.vendorCode++;
self.vendorCodeTextField.text = [NSString stringWithFormat:@"VC00%i",appDelegate.vendorCode];
}
*/
// Fetching Records and saving it in "fetchedRecordsArray" object
self.fetchedRecordsArray2 = [appDelegate getAllVendorRecords];
// Do any additional setup after loading the view, typically from a nib.
}
-(void)settextFieldTitle:(NSArray *)titles
{
self.textfieldArray =[[NSMutableArray alloc]init];
self.textfieldArray = titles;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)returnActionOnTextfield:(id)sender
{
[self.paymentTermsDateTextField resignFirstResponder];
}
- (IBAction)addPhoneBookEntry:(id)sender
{
// Add Entry to PhoneBook Data base and reset all fields
// 1
Vendor * newEntry = [NSEntityDescription insertNewObjectForEntityForName:@"Vendor"
inManagedObjectContext:self.managedObjectContext2];
// 2
newEntry.serialNo = self.serialNoTextField.text;
newEntry.vendorCode = self.vendorCodeTextField.text;
newEntry.vendorName = self.vendorNameTextField.text;
// 6
newEntry.group = self.groupTextField.text;
// 7
newEntry.currency = self.currencyTextField.text;
newEntry.accountBalance = self.accountBalanceTextField.text;
newEntry.dateOfCreation = SYSTEM_CLOCK;
newEntry.telephone1 = self.telephone1Textfield.text;
newEntry.telephone2 = self.telephone1Textfield.text;
newEntry.contactPerson = self.contactPersonTextField.text;
newEntry.contactPerson = self.contactPersonTextField.text;
newEntry.contactPersonNumber = self.contactPersonNumberTextField.text;
newEntry.mobileNumber = self.mobileNumberTextField.text;
newEntry.faxNumber = self.faxNumberTextField.text;
newEntry.email = self.emailTextField.text;
newEntry.remarks = self.remarksTextField.text;
newEntry.status = self.statusTextField.text;
newEntry.paymentTermsDate = SYSTEM_CLOCK;
// 8
NSLog(@"%@",newEntry.serialNo);
// 3
NSError *error;
if (![self.managedObjectContext2 save:&error])
{
NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]);
}
// 4
self.serialNoTextField.text = @"";
self.vendoeCodeTextField.text = @"";
self.vendorNameTextField.text = @"";
self.groupTextField.text = @"";
self.currencyTextField.text = @"";
self.accountBalanceTextField.text = @"";
self.dateOfCreationTextField.text = @"";
self.telepone1Textfield.text = @"";
self.telephone2TextField.text = @"";
self.contactPersonTextField.text = @"";
self.contactPersonNumberTextField.text = @"";
self.mobileNumberTextField.text = @"";
self.faxNumberTextField.text = @"";
self.emailTextField.text = @"";
self.remarksTextField.text = @"";
self.statusTextField.text = @"";
self.paymentTermsDateTextField.text = @"";
// 5
[self.view endEditing:YES];
UIAlertView *view =[[UIAlertView alloc]initWithTitle:@"Added" message:@"Your contacts has been added" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[view show];
}
- (IBAction)showPhoneBook:(id)sender
{
}
-(void)keyboardWillShow
{
// Animate the current view out of the way
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
else if (self.scrollView.frame.origin.y < 0)
{
[self setViewMovedUp:NO];
}
}
-(void)keyboardWillHide
{
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
else if (self.scrollView.frame.origin.y < 0)
{
[self setViewMovedUp:NO];
}
}
-(void)textFieldDidBeginEditing:(UITextField *)sender
{
if ([sender isEqual:self.serialNoTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:NO];
}
}
else if ([sender isEqual:self.vendoeCodeTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.vendorNameTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.groupTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >=0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.currencyTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.accountBalanceTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.dateOfCreationTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.telepone1Textfield])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.telephone2TextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.contactPersonTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.contactPersonNumberTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.mobileNumberTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.faxNumberTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.emailTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.remarksTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.statusTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >=0)
{
[self setViewMovedUp:YES];
}
}
else if ([sender isEqual:self.paymentTermsDateTextField])
{
//move the main view, so that the keyboard does not hide it.
if (self.scrollView.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
}
}
//method to move the view up/down whenever the keyboard is shown/dismissed
-(void)setViewMovedUp:(BOOL)movedUp
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3]; // if you want to slide up the view
CGRect rect = self.scrollView.frame;
if (movedUp)
{
// 1. move the view's origin up so that the text field that will be hidden come above the keyboard
// 2. increase the size of the view so that the area behind the keyboard is covered up.
rect.origin.y -= kOFFSET_FOR_KEYBOARD;
rect.size.height += kOFFSET_FOR_KEYBOARD;
}
else
{
// revert back to the normal state.
rect.origin.y += kOFFSET_FOR_KEYBOARD;
rect.size.height -= kOFFSET_FOR_KEYBOARD;
}
self.scrollView.frame = rect;
[UIView commitAnimations];
}
- (void)viewWillAppear:(BOOL)animated
{
// register for keyboard notifications
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide)
name:UIKeyboardWillHideNotification
object:nil];
}
- (void)viewWillDisappear:(BOOL)animated
{
// unregister for keyboard notifications while not visible.
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillHideNotification
object:nil];
}
#pragma mark - UITextfield Delegate
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
return YES;
}
- (IBAction)pickerViewPressed:(id)sender {
AppDelegate* appDelegate = [UIApplication sharedApplication].delegate;
self.managedObjectContext2 = appDelegate.managedObjectContext;
self.fetchedRecordsArray2 = [appDelegate getAllVendorRecords];
myPickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 100, 320, 200)];
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
[self.view addSubview:myPickerView];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow: (NSInteger)row inComponent:(NSInteger)component {
NSString *currency = [self.currencyArray objectAtIndex:row];
[self.currencyTextField setText:currency ];
[pickerView removeFromSuperview];
}
// tell the picker how many rows are available for a given component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
NSUInteger numRows = [self.currencyArray count];
// NSLog(@"%@",self.currencyArray.count);
return numRows;
}
// tell the picker how many components it will have
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}
// tell the picker the title for a given component
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
//Vendor * selectCurrency = [self.currencyArray objectAtIndex:row];
NSLog(@"%@",self.currencyArray);
NSString *title;
title = [self.currencyArray objectAtIndex:row];
return title;
}
// tell the picker the width of each row for a given component
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
int sectionWidth = 300;
return sectionWidth;
}
最佳答案
将此代码放入您的 View Controller 中..
并委托(delegate)文本域..
//text field or keyboard method start
static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;
static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162;
static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;
static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8;
- (int)extracted_method:(CGFloat)heightFraction
{
return heightFraction < 0.0;
}
-(void) textFieldDidBeginEditing:(UITextField *)textField
{
CGRect textFieldRect = [self.view.window convertRect:textField.bounds fromView:textField];
CGRect viewRect = [self.view.window convertRect:self.view.bounds fromView:self.view];
CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
CGFloat numerator = midline - viewRect.origin.y - MINIMUM_SCROLL_FRACTION * viewRect.size.height;
CGFloat denominator = (MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION) * viewRect.size.height;
CGFloat heightFraction = numerator / denominator;
if([self extracted_method:heightFraction])
{
heightFraction = 0.0;
}
else if(heightFraction > 1.0)
{
heightFraction = 1.0;
}
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
if(orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown){
animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
}
else
{
animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
}
CGRect viewFrame = self.view.frame;
viewFrame.origin.y -= animatedDistance;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
[self.view setFrame:viewFrame];
[UIView commitAnimations];
}
- (void)textFieldDidEndEditing:(UITextField *)textView
{
CGRect viewFrame = self.view.frame;
viewFrame.origin.y += animatedDistance;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
[self.view setFrame:viewFrame];
[UIView commitAnimations];
}
-(BOOL)textFieldShouldReturn:(UITextField * )textField
{
// [TitleOfPosting resignFirstResponder];
[textField resignFirstResponder];
return YES;
// Do the search...
}
关于ios - 出现键盘时向上移动 View ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22350458/