大约有 45,000 项符合查询结果（耗时：0.0207秒） [XML]
@synthesize vs @dynamic, what are the differences?
...it
{
if ((self = [super init])) {
data = [[NSMutableDictionary alloc] init];
[data setObject:@"Tom Sawyer" forKey:@"title"];
[data setObject:@"Mark Twain" forKey:@"author"];
}
return self;
}
- (void)dealloc
{
[data release];
[super dealloc];
}
- (NSMetho...
How can I programmatically check whether a keyboard is present in iOS app?
...tance;
}
+ (void)load
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
sharedInstance = [[self alloc] init];
[pool release];
}
- (BOOL)isVisible
{
return _isVisible;
}
- (void)didShow
{
_isVisible = YES;
}
- (void)didHide
{
_isVisible = NO;
}
- (id)init
{
...
What does @synchronized() do as a singleton method in objective C?
...ES NOT do the same as @syncrhonized, it can be a substitute ONLY under the allocation of a singleton.
– jugutier
Aug 22 '16 at 21:32
add a comment
|
...
Adding a simple UIAlertView
...u want the alert to show, do this:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"ROFL"
message:@"Dee dee doo doo."
delegate:self
...
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...
Convert UTF-8 encoded NSData to NSString
...ated, you should use -initWithData:encoding:
NSString* newStr = [[NSString alloc] initWithData:theData encoding:NSUTF8StringEncoding];
If the data is null-terminated, you should instead use -stringWithUTF8String: to avoid the extra \0 at the end.
NSString* newStr = [NSString stringWithUTF8String:[t...
Is there any overhead to declaring a variable within a loop? (C++)
...
Stack space for local variables is usually allocated in function scope. So no stack pointer adjustment happens inside the loop, just assigning 4 to var. Therefore these two snippets have the same overhead.
...
How do I get the current username in Windows PowerShell?
... -- @Eoin
whoami -- @galaktor
If you want to access the Windows access token:
(more dependable option)
[System.Security.Principal.WindowsIdentity]::GetCurrent().Name -- @MarkSeemann
If you want the name of the logged in user
(rather than the name of the user running the PowerShell instan...
Custom HTTP headers : naming conventions
...d:
message-header = field-name ":" [ field-value ]
field-name = token
field-value = *( field-content | LWS )
field-content = <the OCTETs making up the field-value
and consisting of either *TEXT or combinations
of token, separators, and ...
Most efficient way to remove special characters from string
... @SILENT: No, it doesn't, but you should only do that once. If you allocate an array that large each time you call the method (and if you call the method frequently) then the method becomes the slowest by far, and causes a lot of work for the garbage collector.
– Guffa
...