Tag: object

53 votes
19 answers
1.9K views
performSelector may cause a leak because its selector is unknown

I'm getting the following warning by the ARC compiler: "performSelector may cause a leak because its sel

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Tuan
0 1 0 9
asked 07 September, 2021
61 votes
27 answers
1.6K views
How do I sort an NSMutableArray with custom objects in it?

What I want to do seems pretty simple, but I can't find any answers on the web. I have an NSMutableArray

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Stacia
0 1 0 9
asked 07 September, 2021
66 votes
30 answers
619 views
How can I make a UITextField move up when the keyboard is present - on starting to edit?

With the iOS SDK: I have a UIView with UITextFields that bring up a keyboard. I need it to be able to: Allow s

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Dario
0 1 0 9
asked 07 September, 2021
58 votes
27 answers
1.4K views
What's the difference between the atomic and nonatomic attributes?

What do atomic and nonatomic mean in property declarations? @property(nonatomic, retain) UITextField *userNam

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Mikki
0 1 0 9
asked 07 September, 2021
58 votes
30 answers
1.6K views
How to hide UINavigationBar 1px bottom line

I have an app that sometimes needs its navigation bar to blend in with the content. Does anyone know how to

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Corey
0 1 0 9
asked 07 September, 2021
56 votes
26 answers
2.8K views
dispatch_after - GCD in Swift?

I've gone through the iBook from Apple, and couldn't find any definition of it: Can someone explain

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Emilia
0 1 0 9
asked 07 September, 2021
62 votes
22 answers
2.2K views
UITextField text change event

How can I detect any text changes in a textField? The delegate method shouldChangeCharactersInRange works for

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Freida
0 1 0 9
asked 07 September, 2021
52 votes
30 answers
2.8K views
iOS 8 UITableView separator inset 0 not working

I have an app where the UITableView's separator inset is set to custom values - Right 0, Left 0. This wor

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Trudy
0 1 0 9
asked 07 September, 2021
58 votes
17 answers
778 views
How do I call Objective-C code from Swift?

In Swift, how does one call Objective-C code? Apple mentioned that they could co-exist in one application, bu

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Dorinda
0 1 0 9
asked 07 September, 2021
52 votes
30 answers
713 views
Passing data between view controllers

I'm new to iOS and Objective-C and the whole MVC paradigm and I'm stuck with the following: I have a

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Vi
0 1 0 9
asked 07 September, 2021
57 votes
30 answers
2K views
Detecting an undefined object property

What's the best way of checking if an object property in JavaScript is undefined?

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Mikki
0 1 0 9
asked 07 September, 2021
50 votes
30 answers
1.9K views
How can I check if an object is an array?

I'm trying to write a function that either accepts a list of strings, or a single string. If it's a

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Trudy
0 1 0 9
asked 07 September, 2021
53 votes
30 answers
1.5K views
How do I correctly clone a JavaScript object?

I have an object x. I'd like to copy it as object y, such that changes to y do not modify x. I realized t

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Hallie
0 1 0 9
asked 07 September, 2021
59 votes
25 answers
3K views
Checking if a key exists in a JavaScript object?

How do I check if a particular key exists in a JavaScript object or array? If a key doesn't exist, and I

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Yolando
0 1 0 9
asked 07 September, 2021
65 votes
30 answers
1.1K views
How do I test for an empty JavaScript object?

After an AJAX request, sometimes my application may return an empty object, like: var a = {}; How can I che

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Nereida
0 1 0 9
asked 07 September, 2021
48 votes
30 answers
2K views
How do I check if an array includes a value in JavaScript?

What is the most concise and efficient way to find out if a JavaScript array contains a value? This is the onl

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Omar
0 1 0 9
asked 07 September, 2021
60 votes
30 answers
1.8K views