[英]Moving UITextField that is located under keyboard
因此,就像確定每個iOS程序員遇到一個問題一樣,當試圖讓一個充滿UITextFields的頁面時,很明顯,當鍵盤抬起時,它覆蓋了其中的一半。 因此,我去了Apple的文檔,閱讀了所有內容,並為此編寫了代碼,但是它對我不起作用。 每次我運行視圖時,它都會崩潰。 在此先感謝您的幫助。
.h
文件
@interface NewUserViewController : UIViewController{
}
- (IBAction)signMeUpButtonPressed:(id)sender;
@property (weak, nonatomic) IBOutlet UITextField *activeField;
@property (weak, nonatomic) IBOutlet UIScrollView *contentScrollView;
@property (weak, nonatomic) IBOutlet UIButton *backButton;
@property (weak, nonatomic) IBOutlet UILabel *firstNameLabel;
@property (weak, nonatomic) IBOutlet UITextField *firstNameInput;
@property (weak, nonatomic) IBOutlet UILabel *lastNameLabel;
@property (weak, nonatomic) IBOutlet UITextField *lastNameInput;
@property (weak, nonatomic) IBOutlet UILabel *usernameLabel;
@property (weak, nonatomic) IBOutlet UITextField *usernameInput;
@property (weak, nonatomic) IBOutlet UILabel *emailLabel;
@property (weak, nonatomic) IBOutlet UITextField *emailInput;
@property (weak, nonatomic) IBOutlet UILabel *passwordLabel;
@property (weak, nonatomic) IBOutlet UITextField *setPasswordInput;
@property (weak, nonatomic) IBOutlet UILabel *reenterPasswordLabel;
@property (weak, nonatomic) IBOutlet UITextField *checkSetPasswordInput;
@property (weak, nonatomic) IBOutlet UIButton *signMeUpButton;
全部都連接到它們的插座(活動字段除外。我不確定它屬於哪里或應該連接到什么地方)
.m
文件
@implementation NewUserViewController
@synthesize contentScrollView;
@synthesize activeField;
@synthesize firstNameLabel, lastNameLabel, usernameLabel, emailLabel, passwordLabel, reenterPasswordLabel;
@synthesize firstNameInput, lastNameInput, usernameInput, emailInput, setPasswordInput, checkSetPasswordInput;
@synthesize backButton, signMeUpButton;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
activeField = textField;
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
activeField = nil;
}
- (void)registerForKeyboardNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification object:nil];
}
// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
contentScrollView.contentInset = contentInsets;
contentScrollView.scrollIndicatorInsets = contentInsets;
// If active text field is hidden by keyboard, scroll it so it's visible
// Your application might not need or want this behavior.
CGRect aRect = self.view.frame;
aRect.size.height -= kbSize.height;
if (!CGRectContainsPoint(aRect, activeField.frame.origin) ) {
CGPoint scrollPoint = CGPointMake(0.0, activeField.frame.origin.y-kbSize.height);
[contentScrollView setContentOffset:scrollPoint animated:YES];
}
}
// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
contentScrollView.contentInset = contentInsets;
contentScrollView.scrollIndicatorInsets = contentInsets;
}
- (IBAction)signMeUpButtonPressed:(id)sender {
}
嘗試這個:
- (void)keyboardWasShown:(NSNotification *)notification {
NSDictionary* userInfo = [notification userInfo];
CGRect keyboardEndFrame;
[[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&keyboardEndFrame];
//offset is global
offset = contentScrollView.contentOffset;
CGRect viewFrame = contentScrollView.frame;
CGRect keyboardFrame = [self convertRect:keyboardEndFrame toView:nil];
viewFrame.size.height -= keyboardFrame.size.height;
contentScrollView.frame = viewFrame;
UITextField *current = (UITextField *)[self findFirstResponder];
CGRect textFieldRect = current.frame;
[contentScrollView scrollRectToVisible:textFieldRect animated:YES];
}
- (UIView *)findFirstResponder {
for (UIView *subView in scrollView.subviews) {
if ([subView isFirstResponder]){
return subView;
}
}
return nil;
}
- (void) keyboardWillBeHidden:(NSNotification *)notification {
//scrollViewFrame is global the first frame of you scrollview
contentScrollView.frame = scrollViewFrame;
contentScrollView.contentOffset =offset;
}
這不是完整的代碼,這只是執行您要執行的操作的一點邏輯。
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