How do I convert Objective-C array of pointers to Swift?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}

In Objective-C these are two declarations of array of pointers:

NSArray<MTKMesh *> *mtkMeshes;

NSArray<MDLMesh *> *mdlMeshes;

I am struggling declaring the equivalent in Swift 3.0.

edited Jan 3 at 8:03

Martijn Pieters♦

726k14325482349

asked Nov 12 '16 at 12:48

dugla

6,1542175120

add a comment |

In Objective-C these are two declarations of array of pointers:

NSArray<MTKMesh *> *mtkMeshes;

NSArray<MDLMesh *> *mdlMeshes;

I am struggling declaring the equivalent in Swift 3.0.

edited Jan 3 at 8:03

Martijn Pieters♦

726k14325482349

asked Nov 12 '16 at 12:48

dugla

6,1542175120

add a comment |

In Objective-C these are two declarations of array of pointers:

NSArray<MTKMesh *> *mtkMeshes;

NSArray<MDLMesh *> *mdlMeshes;

I am struggling declaring the equivalent in Swift 3.0.

edited Jan 3 at 8:03

Martijn Pieters♦

726k14325482349

asked Nov 12 '16 at 12:48

dugla

6,1542175120

In Objective-C these are two declarations of array of pointers:

NSArray<MTKMesh *> *mtkMeshes;

NSArray<MDLMesh *> *mdlMeshes;

I am struggling declaring the equivalent in Swift 3.0.

objective-c swift nsarray swift3

edited Jan 3 at 8:03

Martijn Pieters♦

726k14325482349

asked Nov 12 '16 at 12:48

dugla

6,1542175120

edited Jan 3 at 8:03

Martijn Pieters♦

726k14325482349

asked Nov 12 '16 at 12:48

dugla

6,1542175120

edited Jan 3 at 8:03

Martijn Pieters♦

726k14325482349

edited Jan 3 at 8:03

Martijn Pieters♦

726k14325482349

edited Jan 3 at 8:03

Martijn Pieters♦

726k14325482349

asked Nov 12 '16 at 12:48

dugla

6,1542175120

asked Nov 12 '16 at 12:48

dugla

6,1542175120

asked Nov 12 '16 at 12:48

dugla

6,1542175120

add a comment |

1 Answer
1

active

oldest

votes

MTKMesh and MDLMesh are classes (reference types). A variable
of type MTKMesh in Swift is a reference to an object instance,
i.e. what a variable of type MTKMesh * is in Objective-C.

Therefore you can simply declare

var mtkMeshes: [MTKMesh] = 

var mdlMeshes: [MDLMesh] =

Each element of the array is a reference to an object instance:

let mesh1 = MDLMesh()

let mesh2 = MDLMesh()

mdlMeshes.append(mesh1)

mdlMeshes.append(mesh1)

mdlMeshes.append(mesh2)



print(mdlMeshes[0] === mdlMeshes[1]) // true

print(mdlMeshes[0] === mdlMeshes[2]) // false

The first two array elements reference the same object instance, the
last array element references a different instance.
(=== is the "identical-to" operator).

edited Nov 12 '16 at 13:17

answered Nov 12 '16 at 13:03

Martin R

406k57900997

Thanks Martin. In your Swift equivalent I notice you have pre-allocated the arrays which is actually different then the Obj-C. For context, this is a snippet from code that uses mdlMeshes as an inout param to a function that allocates and populates that array. +1 for the '"===" tip.

– dugla
Nov 12 '16 at 13:42

1

@dugla: You can also declare var mtkMeshes: [MDLMesh]? and pass its address to a function func foo(meshes: inout [MDLMesh]?) which allocates and populates the array.

– Martin R
Nov 12 '16 at 14:07

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');
});

Post as a guest

Name

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f40562992%2fhow-do-i-convert-objective-c-array-of-pointers-to-swift%23new-answer', 'question_page');
}
);

Post as a guest

Name

Required, but never shown

1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

MTKMesh and MDLMesh are classes (reference types). A variable
of type MTKMesh in Swift is a reference to an object instance,
i.e. what a variable of type MTKMesh * is in Objective-C.

Therefore you can simply declare

var mtkMeshes: [MTKMesh] = 

var mdlMeshes: [MDLMesh] =

Each element of the array is a reference to an object instance:

let mesh1 = MDLMesh()

let mesh2 = MDLMesh()

mdlMeshes.append(mesh1)

mdlMeshes.append(mesh1)

mdlMeshes.append(mesh2)



print(mdlMeshes[0] === mdlMeshes[1]) // true

print(mdlMeshes[0] === mdlMeshes[2]) // false

The first two array elements reference the same object instance, the
last array element references a different instance.
(=== is the "identical-to" operator).

edited Nov 12 '16 at 13:17

answered Nov 12 '16 at 13:03

Martin R

406k57900997

Thanks Martin. In your Swift equivalent I notice you have pre-allocated the arrays which is actually different then the Obj-C. For context, this is a snippet from code that uses mdlMeshes as an inout param to a function that allocates and populates that array. +1 for the '"===" tip.

– dugla
Nov 12 '16 at 13:42

1

@dugla: You can also declare var mtkMeshes: [MDLMesh]? and pass its address to a function func foo(meshes: inout [MDLMesh]?) which allocates and populates the array.

– Martin R
Nov 12 '16 at 14:07

add a comment |

MTKMesh and MDLMesh are classes (reference types). A variable
of type MTKMesh in Swift is a reference to an object instance,
i.e. what a variable of type MTKMesh * is in Objective-C.

Therefore you can simply declare

var mtkMeshes: [MTKMesh] = 

var mdlMeshes: [MDLMesh] =

Each element of the array is a reference to an object instance:

let mesh1 = MDLMesh()

let mesh2 = MDLMesh()

mdlMeshes.append(mesh1)

mdlMeshes.append(mesh1)

mdlMeshes.append(mesh2)



print(mdlMeshes[0] === mdlMeshes[1]) // true

print(mdlMeshes[0] === mdlMeshes[2]) // false

The first two array elements reference the same object instance, the
last array element references a different instance.
(=== is the "identical-to" operator).

edited Nov 12 '16 at 13:17

answered Nov 12 '16 at 13:03

Martin R

406k57900997

Thanks Martin. In your Swift equivalent I notice you have pre-allocated the arrays which is actually different then the Obj-C. For context, this is a snippet from code that uses mdlMeshes as an inout param to a function that allocates and populates that array. +1 for the '"===" tip.

– dugla
Nov 12 '16 at 13:42

1

@dugla: You can also declare var mtkMeshes: [MDLMesh]? and pass its address to a function func foo(meshes: inout [MDLMesh]?) which allocates and populates the array.

– Martin R
Nov 12 '16 at 14:07

add a comment |

MTKMesh and MDLMesh are classes (reference types). A variable
of type MTKMesh in Swift is a reference to an object instance,
i.e. what a variable of type MTKMesh * is in Objective-C.

Therefore you can simply declare

var mtkMeshes: [MTKMesh] = 

var mdlMeshes: [MDLMesh] =

Each element of the array is a reference to an object instance:

let mesh1 = MDLMesh()

let mesh2 = MDLMesh()

mdlMeshes.append(mesh1)

mdlMeshes.append(mesh1)

mdlMeshes.append(mesh2)



print(mdlMeshes[0] === mdlMeshes[1]) // true

print(mdlMeshes[0] === mdlMeshes[2]) // false

The first two array elements reference the same object instance, the
last array element references a different instance.
(=== is the "identical-to" operator).

edited Nov 12 '16 at 13:17

answered Nov 12 '16 at 13:03

Martin R

406k57900997

MTKMesh and MDLMesh are classes (reference types). A variable
of type MTKMesh in Swift is a reference to an object instance,
i.e. what a variable of type MTKMesh * is in Objective-C.

Therefore you can simply declare

var mtkMeshes: [MTKMesh] = 

var mdlMeshes: [MDLMesh] =

Each element of the array is a reference to an object instance:

let mesh1 = MDLMesh()

let mesh2 = MDLMesh()

mdlMeshes.append(mesh1)

mdlMeshes.append(mesh1)

mdlMeshes.append(mesh2)



print(mdlMeshes[0] === mdlMeshes[1]) // true

print(mdlMeshes[0] === mdlMeshes[2]) // false

The first two array elements reference the same object instance, the
last array element references a different instance.
(=== is the "identical-to" operator).

edited Nov 12 '16 at 13:17

answered Nov 12 '16 at 13:03

Martin R

406k57900997

edited Nov 12 '16 at 13:17

answered Nov 12 '16 at 13:03

Martin R

406k57900997

answered Nov 12 '16 at 13:03

Martin R

406k57900997

answered Nov 12 '16 at 13:03

Martin R

406k57900997

Thanks Martin. In your Swift equivalent I notice you have pre-allocated the arrays which is actually different then the Obj-C. For context, this is a snippet from code that uses mdlMeshes as an inout param to a function that allocates and populates that array. +1 for the '"===" tip.

– dugla
Nov 12 '16 at 13:42

1

@dugla: You can also declare var mtkMeshes: [MDLMesh]? and pass its address to a function func foo(meshes: inout [MDLMesh]?) which allocates and populates the array.

– Martin R
Nov 12 '16 at 14:07

add a comment |

Thanks Martin. In your Swift equivalent I notice you have pre-allocated the arrays which is actually different then the Obj-C. For context, this is a snippet from code that uses mdlMeshes as an inout param to a function that allocates and populates that array. +1 for the '"===" tip.

– dugla
Nov 12 '16 at 13:42

1

@dugla: You can also declare var mtkMeshes: [MDLMesh]? and pass its address to a function func foo(meshes: inout [MDLMesh]?) which allocates and populates the array.

– Martin R
Nov 12 '16 at 14:07

Thanks Martin. In your Swift equivalent I notice you have pre-allocated the arrays which is actually different then the Obj-C. For context, this is a snippet from code that uses mdlMeshes as an inout param to a function that allocates and populates that array. +1 for the '"===" tip.

– dugla
Nov 12 '16 at 13:42

@dugla: You can also declare var mtkMeshes: [MDLMesh]? and pass its address to a function func foo(meshes: inout [MDLMesh]?) which allocates and populates the array.

– Martin R
Nov 12 '16 at 14:07

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');
});

Post as a guest

Name

Required, but never shown

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Name

Required, but never shown

Name

Required, but never shown

This page is only for reference, If you need detailed information, please check here

Search This Blog

Ufyukyu