大约有 7,000 项符合查询结果（耗时：0.0132秒） [XML]
Converting NSString to NSDate (and back again)
...String = @"01-02-2010";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy"];
NSDate *dateFromString = [dateFormatter dateFromString:dateString];
NSDate convert to NSString:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[d...
grep exclude multiple strings
...e.txt:
abc
def
ghi
jkl
grep command using -E option with a pipe between tokens in a string:
grep -Ev 'def|jkl' filename.txt
prints:
abc
ghi
Command using -v option with pipe between tokens surrounded by parens:
egrep -v '(def|jkl)' filename.txt
prints:
abc
ghi
...
“Application tried to present modally an active controller”?
...trollers instantiated like so:
UIViewController* vc1 = [[UIViewController alloc] init];
UIViewController* vc2 = [[UIViewController alloc] init];
UIViewController* vc3 = [[UIViewController alloc] init];
You have added them to a tab bar like this:
UITabBarController* tabBarController = [[UITabBarC...
In C, do braces act as a stack frame?
...[0] here? */
return;
}
(In other words: is the compiler allowed to deallocate d, even if in practice most don't?).
The answer is that the compiler is allowed to deallocate d, and accessing p[0] where the comment indicates is undefined behaviour (the program is not allowed to access the inner ...
How to remove empty cells in UITableView? [duplicate]
...FooterView = UIView()
Objective-C:
tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
Because the table thinks there is a footer to show, it doesn't display any cells beyond those you explicitly asked for.
Interface builder pro-tip:
If you are using a xib/Storyboard, you c...
C++ SFINAE examples?
... in C++, here is what you get with a modern compiler : error C2466: cannot allocate an array of constant size 0
– v.oddou
Jun 16 '14 at 1:31
1
...
Apache Spark: The number of cores vs. the number of executors
...ably be set to 63 *
1024 = 64512 (megabytes) and 15 respectively. We avoid allocating 100%
of the resources to YARN containers because the node needs some
resources to run the OS and Hadoop daemons. In this case, we leave a
gigabyte and a core for these system processes. Cloudera Manager helps
by ac...
What do the parentheses around a function name mean?
...heses, but expansion of a function-like macro only takes place if the next token is a left parenthesis (C99, 6.10.3§10), thus foo (int* bar) would get replaced, but not (foo) (int *bar) (the next token after foo is ))
– Virgile
Nov 28 '12 at 9:48
...
Efficient string concatenation in C++
...e a look at this interface:
template <class charT, class traits, class Alloc>
basic_string<charT, traits, Alloc>
operator+(const basic_string<charT, traits, Alloc>& s1,
const basic_string<charT, traits, Alloc>& s2)
You can see that a new object is returne...
What killed my process and why?
...
I just wrote a program that malloc'd memory in an inifite loop. After the system got slow, "Killed" was displayed in the terminal and the process was terminated. The file /var/log/kern.log contained a lot of info about the termination. -Thanks for the...