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73 lines
3.5 KiB
Objective-C
73 lines
3.5 KiB
Objective-C
//
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// Copyright (c) 2017 Open Whisper Systems. All rights reserved.
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//
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#import "ViewControllerUtils.h"
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#import "PhoneNumber.h"
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#import "StringUtil.h"
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#import <SignalServiceKit/PhoneNumberUtil.h>
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NS_ASSUME_NONNULL_BEGIN
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#pragma mark -
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@implementation ViewControllerUtils
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+ (void)phoneNumberTextField:(UITextField *)textField
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shouldChangeCharactersInRange:(NSRange)range
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replacementString:(NSString *)insertionText
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countryCode:(NSString *)countryCode
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{
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// Phone numbers takes many forms.
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//
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// * We only want to let the user enter decimal digits.
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// * The user shouldn't have to enter hyphen, parentheses or whitespace;
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// the phone number should be formatted automatically.
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// * The user should be able to copy and paste freely.
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// * Invalid input should be simply ignored.
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//
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// We accomplish this by being permissive and trying to "take as much of the user
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// input as possible".
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//
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// * Always accept deletes.
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// * Ignore invalid input.
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// * Take partial input if possible.
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NSString *oldText = textField.text;
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// Construct the new contents of the text field by:
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// 1. Determining the "left" substring: the contents of the old text _before_ the deletion range.
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// Filtering will remove non-decimal digit characters like hyphen "-".
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NSString *left = [oldText substringToIndex:range.location].digitsOnly;
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// 2. Determining the "right" substring: the contents of the old text _after_ the deletion range.
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NSString *right = [oldText substringFromIndex:range.location + range.length].digitsOnly;
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// 3. Determining the "center" substring: the contents of the new insertion text.
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NSString *center = insertionText.digitsOnly;
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// 4. Construct the "raw" new text by concatenating left, center and right.
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NSString *textAfterChange = [[left stringByAppendingString:center] stringByAppendingString:right];
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// 4a. Ensure we don't exceed the maximum length for a e164 phone number,
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// 15 digits, per: https://en.wikipedia.org/wiki/E.164
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const int kMaxPhoneNumberLength = 15;
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if (textAfterChange.length > kMaxPhoneNumberLength) {
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textAfterChange = [textAfterChange substringToIndex:kMaxPhoneNumberLength];
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}
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// 5. Construct the "formatted" new text by inserting a hyphen if necessary.
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// reformat the phone number, trying to keep the cursor beside the inserted or deleted digit
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bool isJustDeletion = insertionText.length == 0;
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NSUInteger cursorPositionAfterChange = MIN(left.length + center.length, textAfterChange.length);
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NSString *textAfterReformat =
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[PhoneNumber bestEffortFormatPartialUserSpecifiedTextToLookLikeAPhoneNumber:textAfterChange
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withSpecifiedCountryCodeString:countryCode];
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NSUInteger cursorPositionAfterReformat = [PhoneNumberUtil translateCursorPosition:cursorPositionAfterChange
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from:textAfterChange
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to:textAfterReformat
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stickingRightward:isJustDeletion];
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textField.text = textAfterReformat;
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UITextPosition *pos =
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[textField positionFromPosition:textField.beginningOfDocument offset:(NSInteger)cursorPositionAfterReformat];
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[textField setSelectedTextRange:[textField textRangeFromPosition:pos toPosition:pos]];
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}
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@end
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NS_ASSUME_NONNULL_END
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