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How to convert an NSString into an NSNumber
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Use an NSNumberFormatter:
NSNumberFormatter *f = [[NSNumberFormatter alloc] init];
f.numberStyle = NSNumberFormatterDecimalStyle;
NSNumber *myNumber = [f numberFromString:@"42"];
If the string is not a valid number, then myNumber will be nil. If it is a valid number, then you now have all of...
How to replace a string in multiple files in linux command line
...e-grep to see if the changes were made. Note: For wildcards, try '-name "*.php"' and grep is bad with recursion and wildcards, you need to add --include=*.whatever with -r
– PJ Brunet
Feb 23 '17 at 18:41
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UITapGestureRecognizer breaks UITableView didSelectRowAtIndexPath
... problem is to:
UITapGestureRecognizer *tapRec = [[UITapGestureRecognizer alloc]
initWithTarget:self action:@selector(tap:)];
[tapRec setCancelsTouchesInView:NO];
This lets the UIGestureRecognizer recognize the tap and also pass the touch to the next responder. An unintended consequence of ...
Do I need to heartbeat to keep a TCP connection open?
...is using DoS attack prevention systems, it (the server) may remove all the allocated resources for that particular connection, after the it detected in-activity for a specified period.
Their no mandate to implement any heartbeat mechanisms.
But its is good if you are designing an application, wh...
iOS 7 - Failing to instantiate default view controller
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Using programmatically :
Objective-C :
self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController *viewController = [storyboard instantiateViewContr...
How can I convert tabs to spaces in every file of a directory?
... I would also add a file matcher like for example for only .php files find ./ -iname "*.php" -type f -exec sed -i 's/\t/ /g' {} \;
– Daniel Luca CleanUnicorn
Mar 26 '13 at 10:04
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How to make URL/Phone-clickable UILabel?
...e:UIFontTextStyleHeadline]};
_label.attributedText = [[NSAttributedString alloc]initWithString:string attributes:attributes];
[_label setFont:[_label.font fontWithSize:13.0]];
[_label setLinkForSubstring:@"Terms of Use" withLinkHandler:^(FRHyperLabel *label, NSString *substring){
[[UIApplicati...
How to sort in mongoose?
...e query.
The Model.find() implementation (at this version) does a sliding allocation of properties to handle optional params (which is what confused me!):
Model.find = function find (conditions, fields, options, callback) {
if ('function' == typeof conditions) {
callback = conditions;
co...
Create an array with same element repeated multiple times
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It's much more efficient to allocate all of the entries up front, with arr = new Array(len);, then assign to them by index in the loop, i.e. arr[i] = value;. That way you only pay O(n) rather than having to keep reallocating the array as it grows. In ...
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize
...XX:MaxMetaspaceSize option.
-XX:PermSize=size
Sets the space (in bytes) allocated to the permanent generation that triggers a garbage collection if it is exceeded. This option was deprecated in JDK 8, and superseded by the -XX:MetaspaceSize option.
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