大约有 30,000 项符合查询结果（耗时：0.0364秒） [XML]
How do I create delegates in Objective-C?
...tions
Instead of checking whether a delegate responds to a selector every time we want to message it, you can cache that information when delegates are set. One very clean way to do this is to use a bitfield, as follows:
@protocol SomethingDelegate <NSObject>
@optional
- (void)something:(id)...
Programmatically relaunch/recreate an activity?
...arget the highest available sdk, so honeycomb will be available at compile time, and the int constant is carried within your application. I believe it is a common pattern to use a sdk int greater than minimum sdk int.
– Hai Zhang
Mar 4 '15 at 1:38
...
How can I hide an HTML table row so that it takes up no space?
...ou include some code? I add style="display:none;" to my table rows all the time and it effectively hides the entire row.
share
|
improve this answer
|
follow
|...
Command line progress bar in Java
I have a Java program running in command line mode.
I would like to display a progress bar, showing the percentage of job done.
The same kind of progress bar you would see using wget under unix.
Is this possible?
...
for each loop in Objective-C for accessing NSMutable dictionary
...
Is this loop return same order all the time? Or do we need another way to use it for TableView sections?
– ymutlu
Oct 31 '14 at 14:55
1
...
Is there a “goto” statement in bash?
....
fi
# ... I want to resume here ...
The difficulty comes in when it's time to rip out your debugging code. The "if false" construct is pretty straightforward and memorable, but how do you find the matching fi? If your editor allows you to block indent, you could indent the skipped block (then...
What's the best practice for primary keys in tables?
...
Just an extra comment on something that is often overlooked. Sometimes not using a surrogate key has benefits in the child tables. Let's say we have a design that allows you to run multiple companies within the one database (maybe it's a hosted solution, or whatever).
Let's say we have th...
What does a tilde do when it precedes an expression?
... to use .indexOf() as a boolean directly, then that won't work because sometimes it returns zero (when "something" is at the beginning of the string).
Of course, this works too:
if (someString.indexOf(something) >= 0) {
}
and it's considerably less mysterious.
Sometimes you'll also see this...
'Static readonly' vs. 'const'
...-site; this is double edged:
it is useless if the value is fetched at runtime, perhaps from config
if you change the value of a const, you need to rebuild all the clients
but it can be faster, as it avoids a method call...
...which might sometimes have been inlined by the JIT anyway
If the value...
Why is a combiner needed for reduce method that converts type in java 8
...w World of Java functional programming that, I have been assured countless times, "makes your code more concise and easier to read." Let's hope that examples of (finger quotes) concise clearness such as this remain few and far between.
– dnuttle
May 23 '19 at 1...