autofill SMS code webview crash https://openradar.appspot.com/7428013

autofill-sms-code-webview-crash.swift

func swizzleReplacingCharacters() {
        let originalMethod = class_getInstanceMethod(
            NSString.self, #selector(NSString.replacingCharacters(in:with:)))

        let swizzledMethod = class_getInstanceMethod(
            NSString.self, #selector(NSString.swizzledReplacingCharacters(in:with:)))

        guard let original = originalMethod, let swizzled = swizzledMethod else {
            return
        }

        method_exchangeImplementations(original, swizzled)
}

extension NSString {
    @objc
    func swizzledReplacingCharacters(in range: NSRange, with replacement: String) -> String {
        /// By simply calling the original method the nil argument is handled. :shrug: :ok:
        ///
        /// (yes, we will call the original method and not ourselves even though it looks like it,
        /// because the methods have been swapped.)
        return self.swizzledReplacingCharacters(in: range, with: replacement)
    }
}

@zsj25502 you need to call swizzledReplacingCharacters from the AppDelegate if you want it to swap the two methods.

Hi, @Lorex7, thank you so much for the reply. I am pretty new to iOS development, and the existing project seems to be very complex, Would you be able to provide a more detail example on how to call this method in the AppDelegate.swift file, so that whenever the text is replacing it will trigger the new customized method? Thank you!!

@Lorex7 and Kyle, Thank you both so much!!! I managed to call it in the AppDelegate and everything looks perfect now!!!! Thanks again!

Hi Kyle, thanks for sharing your method.
But i use Objective-C.. So Could you please let me know how to call that method in Objecitve-C?
i'm trying add "public"in front of function name but failed..
too difficult.TT

Does it mean, default ObjC implementation fails on empty tagged string, and Swift bridges empty tagged string to empty string? 😮
I once observed the same behavior in NSData. Nil NSData bridged to empty Data 🤣

Hi Kyle, thanks for sharing your method.
But i use Objective-C.. So Could you please let me know how to call that method in Objecitve-C?
i'm trying add "public"in front of function name but failed..
too difficult.TT

did you have any solutions?

Here is Objective-c code. @yangloria @choi-bong-sik
This is from @acruis, Thanks

NSString+Swizzle.h

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface NSString (Swizzle)

@end

NS_ASSUME_NONNULL_END

NSString+Swizzle.m

#import "NSString+Swizzle.h"
#import <objc/runtime.h>

@implementation NSString (Swizzle)

+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Class class = [self class];

        SEL originalSelector = @selector(stringByReplacingCharactersInRange:withString:);
        SEL swizzledSelector = @selector(swizzle_stringByReplacingCharactersInRange:withString:);

        Method originalMethod = class_getInstanceMethod(class, originalSelector);
        Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);

        BOOL success = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod));
        if (success) {
            class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
        } else {
            method_exchangeImplementations(originalMethod, swizzledMethod);
        }
    });
}

- (NSString *)swizzle_stringByReplacingCharactersInRange:(NSRange)range withString:(NSString *)replacement
{
    return [self swizzle_stringByReplacingCharactersInRange:range withString:replacement ?: @""];
}

@end

Here is Objective-c code. @yangloria @choi-bong-sik
This is from @acruis, Thanks

NSString+Swizzle.h

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface NSString (Swizzle)

@end

NS_ASSUME_NONNULL_END

NSString+Swizzle.m

#import "NSString+Swizzle.h"
#import <objc/runtime.h>

@implementation NSString (Swizzle)

+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Class class = [self class];

        SEL originalSelector = @selector(stringByReplacingCharactersInRange:withString:);
        SEL swizzledSelector = @selector(swizzle_stringByReplacingCharactersInRange:withString:);

        Method originalMethod = class_getInstanceMethod(class, originalSelector);
        Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);

        BOOL success = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod));
        if (success) {
            class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
        } else {
            method_exchangeImplementations(originalMethod, swizzledMethod);
        }
    });
}

- (NSString *)swizzle_stringByReplacingCharactersInRange:(NSRange)range withString:(NSString *)replacement
{
    return [self swizzle_stringByReplacingCharactersInRange:range withString:replacement ?: @""];
}

@end

Should I import "NSString+Swizzle.h" into AppDelegate.m and run load() function or it works without import anything.
If should import, please show me how to import it into AppDelegate.m
Please answer me @623637646, I stuck at this for the whole day, Thanks.

Should I import "NSString+Swizzle.h" into AppDelegate.m and run load() function or it works without import anything.
If should import, please show me how to import it into AppDelegate.m
Please answer me @623637646, I stuck at this for the whole day, Thanks.

Hi @kyunkakata , No need to import it. Just add those files to your project. The + (void)load will be called automatically.

Should I import "NSString+Swizzle.h" into AppDelegate.m and run load() function or it works without import anything.
If should import, please show me how to import it into AppDelegate.m
Please answer me @623637646, I stuck at this for the whole day, Thanks.

Hi @kyunkakata , No need to import it. Just add those files to your project. The + (void)load will be called automatically.

Thank you @623637646

@kyunkakata Thanks your code :)
Can I use your code in my commercial app?
Please let me know how I can use the code for commercial distribution.

That was @623637646 's code.

hi @seyoung-hyun . Feel free to use it. do remember to test before release to live.

@kyunkakata Sorry for confusing you.
@623637646 Thanks your reply :)

hi @kyle-ilantzis.
I wonder if I use your code at this gist in my commercial app, too.
Please let me know how I can use the code for commercial distribution.
Thanks :)