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That definition would conlude that the string " /r/n /r/n" is empty, when it clearly is not - it contains whitespace. Your function is really: -(BOOL)isWhitespace(NSString*);

JBRWilkinson
– JBRWilkinson

2010-03-28 20:52:24 +00:00
Commented Mar 28, 2010 at 20:52
6

A corollary to this. I implemented this category, and there is a twist. If you call this on a nil string, this function is never called, and you get back a NO(or what evaluates to NO) as a return value. Then you think it's not empty...This might work if the name was isFilled or something like that.

Ying
– Ying

2010-10-29 13:53:28 +00:00
Commented Oct 29, 2010 at 13:53
I guess the right category would then be: @implementation NSString (Empty) - (BOOL) empty{ return ([[self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]length] == 0); } @end As a combination of Marc's and Kyle's answer.

palme
– palme

2013-09-25 12:00:43 +00:00
Commented Sep 25, 2013 at 12:00

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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
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indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
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