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Top Questions
97
votes
How to use performSelector:withObject:afterDelay: with primitive types in Cocoa?
objective-c
cocoa
asked May 24 '09 at 19:46
stackoverflow.com
61
votes
What's the difference between a protocol extended from AnyObject and a class-only protocol?
class
swift
protocols
asked May 11 '15 at 20:13
stackoverflow.com
49
votes
Alternative to performSelector in Swift?
swift
performselector
asked Jun 11 '14 at 8:44
stackoverflow.com
41
votes
Ruby accessing outer variables in nested function
ruby
nested
variable-scope
asked Jun 19 '09 at 5:04
stackoverflow.com
26
votes
Python-style integer division & modulus in C
java
c++
c
modulo
division
asked May 6 '09 at 5:02
stackoverflow.com
25
votes
Objective-C @available guard AND'ed with more conditions
ios
objective-c
xcode9
availability
asked Oct 26 '17 at 23:32
stackoverflow.com
16
votes
Are strtol, strtod unsafe?
c
const
stdlib
c-strings
const-char
asked Jun 14 '09 at 20:36
stackoverflow.com
16
votes
Could excess 401(k) contributions be used to game/maximize matches from different employers?
united-states
401k
excess-contribution
employer-match
asked Mar 8 '12 at 10:16
money.stackexchange.com
15
votes
Calling method using optional chaining on weak variable causes EXC_BAD_ACCESS
swift
weak-references
asked Jun 11 '14 at 23:44
stackoverflow.com
13
votes
Can't make weak reference to closure in Swift
swift
closures
objective-c-blocks
weak-references
retain-cycle
asked Jul 12 '14 at 21:24
stackoverflow.com
1
2
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Top Answers
928
Simple way to repeat a string
stackoverflow.com
144
Strip Non-Alphanumeric Characters from an NSString
stackoverflow.com
91
How to get matches in iOS using regular expression?
stackoverflow.com
83
Where's the difference between setObject:forKey: and setValue:forKey: in NSMutableDictionary?
stackoverflow.com
48
Can I use my Chinese passport to enter China after I acquired another citizenship?
travel.stackexchange.com
46
How to return nil in swift in a custom initializer?
stackoverflow.com
45
What to do when visa admission expires during lockdown?
travel.stackexchange.com
45
What would be the fastest method to test for primality in Java?
stackoverflow.com
43
How to I pass @selector as a parameter?
stackoverflow.com
43
How can I check if I am banned from travelling to the US?
travel.stackexchange.com
38
How is it that Ted Cruz can run for the U.S. presidency seeing as he was born in Calgary?
politics.stackexchange.com
36
Is the ban on applying for a US visa after marriage fraud a lifetime ban or 10 years?
travel.stackexchange.com
34
What is the difference between instanceof and Class.isAssignableFrom(…)?
stackoverflow.com
32
UIView Autoresizing Resources
stackoverflow.com
31
What new data caused Biden to be declared winner by the news?
politics.stackexchange.com
31
USA Tourist Visa Extension due to Covid-19 also Airlift for Indian nationals in the US details
travel.stackexchange.com
29
Will Canadian citizens be denied entry to Canada during COVID-19 border closure?
travel.stackexchange.com
29
Canadian overstayed in the US for 14 years. Can I leave to Canada and return back to the US?
travel.stackexchange.com
27
Is the “Visa Waiver Program Improvement and Terrorist Travel Prevention Act” already valid?
travel.stackexchange.com
24
Overstayed my US visa for over 9 years, never got deported, can I return as a tourist?
travel.stackexchange.com
23
get UIView's viewcontroller (iphone)
stackoverflow.com
23
Can I lose my US citizenship for accepting employment with a foreign government?
expatriates.stackexchange.com
23
does NSThread create autoreleasepool automatically now?
stackoverflow.com
21
Why doesn't the U.S. government pay interest on tax withholding returned via a refund?
money.stackexchange.com
21
Do I need to trigger my ESTA?
travel.stackexchange.com
21
Can my spouse work in her home country before entering the US on a J-2?
expatriates.stackexchange.com
21
Is a citizen of Canada required to apply for a US visitor visa after visiting Iran?
travel.stackexchange.com
21
adding attributes to a Ruby object dynamically
stackoverflow.com
20
Can I be a citizen of a country but do not have the right to live there?
expatriates.stackexchange.com
20
US visa overstay on a F1 visa and returning home
travel.stackexchange.com
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