UITextField切断了文本的右侧，并且没有在正确的位置显示光标

Question

This problem can be demonstrated by creating a new project in Xcode (I am using version 6.4) and using the following code:

@interface ViewController ()
@property (nonatomic, strong) UITextField * myTextField;
@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];
    self.myTextField = [[UITextField alloc] initWithFrame:CGRectMake(50, 50, self.view.frame.size.width-100, 50)];
    self.myTextField.textAlignment = NSTextAlignmentRight;
    [self.myTextField becomeFirstResponder];
    self.myTextField.backgroundColor = [UIColor lightGrayColor]
    self.myTextField.adjustsFontSizeToFitWidth = YES;
    self.myTextField.font = [UIFont systemFontOfSize:40];
    [self.view addSubview:self.myTextField];
}

- (void) viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];
    self.myTextField.text = @"1.5241578750119E18";
}

When running this project in iOS Simulator (iPhone 5 or 5S), the cursor is initially displayed after the last "1", and the "8" is not visible until a new character is typed.

This appears to be a bug by Apple, but my question is: is there a workaround for now that will force the text to right-align and show the cursor in the correct position?

To clarify the question further, the issue occurs when the text is set programmatically. I expect to see this:

But instead I am seeing this (note that the entire number is not visible and the cursor is showing after the "1" instead of the last digit which is an "8"):

Answer 1

This is a bug, existing in iOS, since iOS 7. Issue can be reproduced in stock applications like Settings as well. It affects text fields only when NSTextAlignmentRight is used. The original bug ID logged into Radar for this issue is 14485694 . You may use centre or left text alignments, to circumvent this problem.

I would also suggest to file a new bug report to Apple,

Answer 2

Try this

UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 20)];
self.myTextField.leftView = paddingView;
self.myTextField.leftViewMode = UITextFieldViewModeAlways;

it will add some space to the left side of your TextField so that your cursor starts at correct position.

Hope it helps.

Answer 3

If I change your code to this:

- (void)viewDidLoad {

    [super viewDidLoad];
        self.myTextField = [[UITextField alloc] initWithFrame:CGRectMake(5, 50, self.view.frame.size.width-10, 50)];
    self.myTextField.textAlignment = NSTextAlignmentRight;
    [self.myTextField becomeFirstResponder];
    self.myTextField.backgroundColor = [UIColor lightGrayColor];
    self.myTextField.adjustsFontSizeToFitWidth = YES;
    self.myTextField.font = [UIFont systemFontOfSize:60];
    [self.view addSubview:self.myTextField];
}

And start typing in those numbers, the cursor ends up along the right edge of the text field just as it's supposed to.

Even when I start the app with the default value in the text, I see the cursor along the right edge of the text field fine.

Answer 4

听UITextFieldTextDidChangeNotification通知而不是UIControlEventEditingChanged可以解决此问题。

Answer 5

I met the same issue, try add dummy code like this

(void)textFieldDidBeginEditing:(UITextField *)textField {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    textField.text = textField.text;
});
}