Mixing
Struggling to convert Objective C selector and target signature to Swift
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}
3
Good Day,
I am trying to convert an Objective C snippet to Swift. I understand the selector can be translated directly by placing it in a string, but I cannot understand the Objective C signature.:
The Objectice C selector (2nd parameter):
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
The target:
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
My Questions are:
1.Can I simply pass the selector as :
UIImageWriteToSavedPhotosAlbum(image, self, "image:didFinishSavingWithError:contextInfo:", nil);
2.Please help me with the singnature of the target function. I am stumped!
ios objective-c swift selector
edited Jan 3 at 8:02
Martijn Pieters♦
726k14325482349
asked Aug 3 '14 at 20:40
weePeeweePee
717620
|
show 3 more comments
3
Good Day,
I am trying to convert an Objective C snippet to Swift. I understand the selector can be translated directly by placing it in a string, but I cannot understand the Objective C signature.:
The Objectice C selector (2nd parameter):
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
The target:
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
My Questions are:
1.Can I simply pass the selector as :
UIImageWriteToSavedPhotosAlbum(image, self, "image:didFinishSavingWithError:contextInfo:", nil);
2.Please help me with the singnature of the target function. I am stumped!
ios objective-c swift selector
edited Jan 3 at 8:02
Martijn Pieters♦
726k14325482349
asked Aug 3 '14 at 20:40
weePeeweePee
717620
1
Did you try it? Does it work?
– jtbandes
Aug 3 '14 at 20:41
@jtbandes : Sorry I am unsure what you mean? What should I try?
– weePee
Aug 3 '14 at 20:45
Part of your question is "Can I do x?" Did you try x? What problem are you having?
– jtbandes
Aug 3 '14 at 20:47
Yes I did. I received an error : 'NSInvalidArgumentException ... does not respond to selector image:didFinishSavingWithError:contextInfo:'
– weePee
Aug 3 '14 at 20:50
1
Hi there, yes I have and I have implemented a few selectors. All with no parameters in the target function. So thats easy for me, I dont know objective C well enough to translate "- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{" into Swift
– weePee
Aug 3 '14 at 20:59
|
show 3 more comments
3
3
3
2
Good Day,
I am trying to convert an Objective C snippet to Swift. I understand the selector can be translated directly by placing it in a string, but I cannot understand the Objective C signature.:
The Objectice C selector (2nd parameter):
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
The target:
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
My Questions are:
1.Can I simply pass the selector as :
UIImageWriteToSavedPhotosAlbum(image, self, "image:didFinishSavingWithError:contextInfo:", nil);
2.Please help me with the singnature of the target function. I am stumped!
ios objective-c swift selector
edited Jan 3 at 8:02
Martijn Pieters♦
726k14325482349
asked Aug 3 '14 at 20:40
weePeeweePee
717620
Good Day,
I am trying to convert an Objective C snippet to Swift. I understand the selector can be translated directly by placing it in a string, but I cannot understand the Objective C signature.:
The Objectice C selector (2nd parameter):
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
The target:
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
My Questions are:
1.Can I simply pass the selector as :
UIImageWriteToSavedPhotosAlbum(image, self, "image:didFinishSavingWithError:contextInfo:", nil);
2.Please help me with the singnature of the target function. I am stumped!
ios objective-c swift selector
ios objective-c swift selector
edited Jan 3 at 8:02
Martijn Pieters♦
726k14325482349
asked Aug 3 '14 at 20:40
weePeeweePee
717620
edited Jan 3 at 8:02
Martijn Pieters♦
726k14325482349
asked Aug 3 '14 at 20:40
weePeeweePee
717620
edited Jan 3 at 8:02
Martijn Pieters♦
726k14325482349
edited Jan 3 at 8:02
Martijn Pieters♦
726k14325482349
edited Jan 3 at 8:02
Martijn Pieters♦
726k14325482349
726k14325482349
asked Aug 3 '14 at 20:40
weePeeweePee
717620
asked Aug 3 '14 at 20:40
weePeeweePee
717620
asked Aug 3 '14 at 20:40
weePeeweePee
717620
717620
1
Did you try it? Does it work?
– jtbandes
Aug 3 '14 at 20:41
@jtbandes : Sorry I am unsure what you mean? What should I try?
– weePee
Aug 3 '14 at 20:45
Part of your question is "Can I do x?" Did you try x? What problem are you having?
– jtbandes
Aug 3 '14 at 20:47
Yes I did. I received an error : 'NSInvalidArgumentException ... does not respond to selector image:didFinishSavingWithError:contextInfo:'
– weePee
Aug 3 '14 at 20:50
1
Hi there, yes I have and I have implemented a few selectors. All with no parameters in the target function. So thats easy for me, I dont know objective C well enough to translate "- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{" into Swift
– weePee
Aug 3 '14 at 20:59
|
show 3 more comments
1
Did you try it? Does it work?
– jtbandes
Aug 3 '14 at 20:41
@jtbandes : Sorry I am unsure what you mean? What should I try?
– weePee
Aug 3 '14 at 20:45
Part of your question is "Can I do x?" Did you try x? What problem are you having?
– jtbandes
Aug 3 '14 at 20:47
Yes I did. I received an error : 'NSInvalidArgumentException ... does not respond to selector image:didFinishSavingWithError:contextInfo:'
– weePee
Aug 3 '14 at 20:50
1
Hi there, yes I have and I have implemented a few selectors. All with no parameters in the target function. So thats easy for me, I dont know objective C well enough to translate "- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{" into Swift
– weePee
Aug 3 '14 at 20:59
1
1
Did you try it? Does it work?
– jtbandes
Aug 3 '14 at 20:41
Did you try it? Does it work?
– jtbandes
Aug 3 '14 at 20:41
@jtbandes : Sorry I am unsure what you mean? What should I try?
– weePee
Aug 3 '14 at 20:45
@jtbandes : Sorry I am unsure what you mean? What should I try?
– weePee
Aug 3 '14 at 20:45
Part of your question is "Can I do x?" Did you try x? What problem are you having?
– jtbandes
Aug 3 '14 at 20:47
Part of your question is "Can I do x?" Did you try x? What problem are you having?
– jtbandes
Aug 3 '14 at 20:47
Yes I did. I received an error : 'NSInvalidArgumentException ... does not respond to selector image:didFinishSavingWithError:contextInfo:'
– weePee
Aug 3 '14 at 20:50
Yes I did. I received an error : 'NSInvalidArgumentException ... does not respond to selector image:didFinishSavingWithError:contextInfo:'
– weePee
Aug 3 '14 at 20:50
1
1
Hi there, yes I have and I have implemented a few selectors. All with no parameters in the target function. So thats easy for me, I dont know objective C well enough to translate "- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{" into Swift
– weePee
Aug 3 '14 at 20:59
Hi there, yes I have and I have implemented a few selectors. All with no parameters in the target function. So thats easy for me, I dont know objective C well enough to translate "- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{" into Swift
– weePee
Aug 3 '14 at 20:59
|
show 3 more comments
1 Answer
1
active
oldest
votes
8
To convert from an Objective-C method name to Swift the first parameter name in the Objective C method becomes the function name and then the remaining parameters become the parameters of the function.
In your case, the first parameter name is image, so the function name in Swift will be image.
So,
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
becomes the slightly odd looking -
func image(image: UIImage, didFinishSavingWithError: NSError, contextInfo:UnsafePointer<Void>) {
}
To make things a bit simpler, you an use a different internal parameter name for the error -
func image(image: UIImage, didFinishSavingWithError error: NSError, contextInfo:UnsafePointer<Void>) {
}
edited May 16 '15 at 19:09
luk2302
34.5k1773101
answered Aug 4 '14 at 3:40
Paulw11Paulw11
70.5k1090107
Thank you so much Paul. The explanation is perfect...
– weePee
Aug 4 '14 at 13:23
This is a wonderful solution. I spent hours trying to figure this out before stumbling upon this answer. Is it possible to have a function name that differs from the first argument, and reference that through the Selector() call?
– NolanDC
Nov 29 '14 at 17:11
UIImage *andNSError *in Objective-C should becomeUIImage!andNSError!in swift. What you have is not safe.
– user102008
May 17 '15 at 4:55
@user102008: You are correct.. keep in mind this question was asked and answered during Swift Beta, a month after it was initially released.
– weePee
Aug 9 '15 at 6:21
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f25108888%2fstruggling-to-convert-objective-c-selector-and-target-signature-to-swift%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
8
To convert from an Objective-C method name to Swift the first parameter name in the Objective C method becomes the function name and then the remaining parameters become the parameters of the function.
In your case, the first parameter name is image, so the function name in Swift will be image.
So,
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
becomes the slightly odd looking -
func image(image: UIImage, didFinishSavingWithError: NSError, contextInfo:UnsafePointer<Void>) {
}
To make things a bit simpler, you an use a different internal parameter name for the error -
func image(image: UIImage, didFinishSavingWithError error: NSError, contextInfo:UnsafePointer<Void>) {
}
edited May 16 '15 at 19:09
luk2302
34.5k1773101
answered Aug 4 '14 at 3:40
Paulw11Paulw11
70.5k1090107
Thank you so much Paul. The explanation is perfect...
– weePee
Aug 4 '14 at 13:23
This is a wonderful solution. I spent hours trying to figure this out before stumbling upon this answer. Is it possible to have a function name that differs from the first argument, and reference that through the Selector() call?
– NolanDC
Nov 29 '14 at 17:11
UIImage *andNSError *in Objective-C should becomeUIImage!andNSError!in swift. What you have is not safe.
– user102008
May 17 '15 at 4:55
@user102008: You are correct.. keep in mind this question was asked and answered during Swift Beta, a month after it was initially released.
– weePee
Aug 9 '15 at 6:21
add a comment |
8
To convert from an Objective-C method name to Swift the first parameter name in the Objective C method becomes the function name and then the remaining parameters become the parameters of the function.
In your case, the first parameter name is image, so the function name in Swift will be image.
So,
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
becomes the slightly odd looking -
func image(image: UIImage, didFinishSavingWithError: NSError, contextInfo:UnsafePointer<Void>) {
}
To make things a bit simpler, you an use a different internal parameter name for the error -
func image(image: UIImage, didFinishSavingWithError error: NSError, contextInfo:UnsafePointer<Void>) {
}
edited May 16 '15 at 19:09
luk2302
34.5k1773101
answered Aug 4 '14 at 3:40
Paulw11Paulw11
70.5k1090107
Thank you so much Paul. The explanation is perfect...
– weePee
Aug 4 '14 at 13:23
This is a wonderful solution. I spent hours trying to figure this out before stumbling upon this answer. Is it possible to have a function name that differs from the first argument, and reference that through the Selector() call?
– NolanDC
Nov 29 '14 at 17:11
UIImage *andNSError *in Objective-C should becomeUIImage!andNSError!in swift. What you have is not safe.
– user102008
May 17 '15 at 4:55
@user102008: You are correct.. keep in mind this question was asked and answered during Swift Beta, a month after it was initially released.
– weePee
Aug 9 '15 at 6:21
add a comment |
8
8
8
To convert from an Objective-C method name to Swift the first parameter name in the Objective C method becomes the function name and then the remaining parameters become the parameters of the function.
In your case, the first parameter name is image, so the function name in Swift will be image.
So,
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
becomes the slightly odd looking -
func image(image: UIImage, didFinishSavingWithError: NSError, contextInfo:UnsafePointer<Void>) {
}
To make things a bit simpler, you an use a different internal parameter name for the error -
func image(image: UIImage, didFinishSavingWithError error: NSError, contextInfo:UnsafePointer<Void>) {
}
edited May 16 '15 at 19:09
luk2302
34.5k1773101
answered Aug 4 '14 at 3:40
Paulw11Paulw11
70.5k1090107
To convert from an Objective-C method name to Swift the first parameter name in the Objective C method becomes the function name and then the remaining parameters become the parameters of the function.
In your case, the first parameter name is image, so the function name in Swift will be image.
So,
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
becomes the slightly odd looking -
func image(image: UIImage, didFinishSavingWithError: NSError, contextInfo:UnsafePointer<Void>) {
}
To make things a bit simpler, you an use a different internal parameter name for the error -
func image(image: UIImage, didFinishSavingWithError error: NSError, contextInfo:UnsafePointer<Void>) {
}
edited May 16 '15 at 19:09
luk2302
34.5k1773101
answered Aug 4 '14 at 3:40
Paulw11Paulw11
70.5k1090107
edited May 16 '15 at 19:09
luk2302
34.5k1773101
edited May 16 '15 at 19:09
luk2302
34.5k1773101
edited May 16 '15 at 19:09
luk2302
34.5k1773101
34.5k1773101
answered Aug 4 '14 at 3:40
Paulw11Paulw11
70.5k1090107
answered Aug 4 '14 at 3:40
Paulw11Paulw11
70.5k1090107
answered Aug 4 '14 at 3:40
Paulw11Paulw11
70.5k1090107
70.5k1090107
Thank you so much Paul. The explanation is perfect...
– weePee
Aug 4 '14 at 13:23
This is a wonderful solution. I spent hours trying to figure this out before stumbling upon this answer. Is it possible to have a function name that differs from the first argument, and reference that through the Selector() call?
– NolanDC
Nov 29 '14 at 17:11
UIImage *andNSError *in Objective-C should becomeUIImage!andNSError!in swift. What you have is not safe.
– user102008
May 17 '15 at 4:55
@user102008: You are correct.. keep in mind this question was asked and answered during Swift Beta, a month after it was initially released.
– weePee
Aug 9 '15 at 6:21
add a comment |
Thank you so much Paul. The explanation is perfect...
– weePee
Aug 4 '14 at 13:23
This is a wonderful solution. I spent hours trying to figure this out before stumbling upon this answer. Is it possible to have a function name that differs from the first argument, and reference that through the Selector() call?
– NolanDC
Nov 29 '14 at 17:11
UIImage *andNSError *in Objective-C should becomeUIImage!andNSError!in swift. What you have is not safe.
– user102008
May 17 '15 at 4:55
@user102008: You are correct.. keep in mind this question was asked and answered during Swift Beta, a month after it was initially released.
– weePee
Aug 9 '15 at 6:21
Thank you so much Paul. The explanation is perfect...
– weePee
Aug 4 '14 at 13:23
Thank you so much Paul. The explanation is perfect...
– weePee
Aug 4 '14 at 13:23
This is a wonderful solution. I spent hours trying to figure this out before stumbling upon this answer. Is it possible to have a function name that differs from the first argument, and reference that through the Selector() call?
– NolanDC
Nov 29 '14 at 17:11
This is a wonderful solution. I spent hours trying to figure this out before stumbling upon this answer. Is it possible to have a function name that differs from the first argument, and reference that through the Selector() call?
– NolanDC
Nov 29 '14 at 17:11
UIImage * and NSError * in Objective-C should become UIImage! and NSError! in swift. What you have is not safe.– user102008
May 17 '15 at 4:55
UIImage * and NSError * in Objective-C should become UIImage! and NSError! in swift. What you have is not safe.– user102008
May 17 '15 at 4:55
@user102008: You are correct.. keep in mind this question was asked and answered during Swift Beta, a month after it was initially released.
– weePee
Aug 9 '15 at 6:21
@user102008: You are correct.. keep in mind this question was asked and answered during Swift Beta, a month after it was initially released.
– weePee
Aug 9 '15 at 6:21
add a comment |
draft saved
draft discarded
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f25108888%2fstruggling-to-convert-objective-c-selector-and-target-signature-to-swift%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
Did you try it? Does it work?
– jtbandes
Aug 3 '14 at 20:41
@jtbandes : Sorry I am unsure what you mean? What should I try?
– weePee
Aug 3 '14 at 20:45
Part of your question is "Can I do x?" Did you try x? What problem are you having?
– jtbandes
Aug 3 '14 at 20:47
Yes I did. I received an error : 'NSInvalidArgumentException ... does not respond to selector image:didFinishSavingWithError:contextInfo:'
– weePee
Aug 3 '14 at 20:50
1
Hi there, yes I have and I have implemented a few selectors. All with no parameters in the target function. So thats easy for me, I dont know objective C well enough to translate "- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{" into Swift
– weePee
Aug 3 '14 at 20:59