tanb

NSOperation

In OS X v10.6 and later, operation queues ignore the value returned by this method and always start operations on a separate thread.

Concurrent Versus Non-Concurrent Operations

If you plan on executing an operation object manually, instead of adding it to a queue, you can design your operation to execute in a concurrent or non-concurrent manner. Operation objects are non-concurrent by default. In a non-concurrent operation, the operation’s task is performed synchronously—that is, the operation object does not create a separate thread on which to run the task. Thus, when you call the start method of a non-concurrent operation directly from your code, the operation executes immediately in the current thread. By the time the start method of such an object returns control to the caller, the task itself is complete.

In contrast to a non-concurrent operation, which runs synchronously, a concurrent operation runs asynchronously. In other words, when you call the start method of a co

tanb

https://developer.apple.com/jp/devcenter/ios/library/documentation/EventHandlingiPhoneOS.pdf
https://developer.apple.com/library/ios/documentation/EventHandling/Conceptual/EventHandlingiPhoneOS/multitouch_background/multitouch_background.html

tanb

https://developer.apple.com/jp/devcenter/ios/library/documentation/AutolayoutPG.pdf
https://developer.apple.com/library/ios/recipes/xcode_help-interface_builder/articles/UnderstandingAutolayout.html
https://developer.apple.com/library/ios/documentation/AppKit/Reference/NSLayoutConstraint_Class/NSLayoutConstraint/NSLayoutConstraint.html
https://developer.apple.com/videos/wwdc/2012/?id=202

tanb

WARNING: The locate database (/var/db/locate.database) does not exist.
To create the database, run the following command:

  sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist

Please be aware that the database can take some time to generate; once
the database has been created, this message will no longer appear.

tanb

    NSObject *obj = [NSObject new];
    NSObject *copyObj = [obj copy];

tanb

(lldb) po tb_descriptionForClassName(@"UIView")
$1 = 0x075ee730 --description--
class:
  UIView

ivars:
	_layer, @"CALayer"
	_tapInfo, @
	_gestureInfo, @
	_gestureRecognizers, @"NSMutableArray"

tanb

NSInteger column = 2;
SEL sel = NSSelectorFromString(@"numberOfRowsInColumn:");
NSInvocation *inv = [NSInvocation invocationWithMethodSignature:[datePickerView methodSignatureForSelector:sel]];
[inv setSelector:sel];
[inv setTarget:datePickerView];
[inv setArgument:&column atIndex:2];
[inv invoke];
NSUInteger length = [[inv methodSignature] methodReturnLength];
NSInteger buffer = (NSInteger)malloc(length);
[inv getReturnValue:&buffer];

tanb

<UIDatePicker: 0x75561c0; frame = (0 0; 320 216); layer = <CALayer: 0x75563a0>>
   | <_UIDatePickerView: 0x7556690; frame = (0 0; 320 216); autoresize = W+H; layer = <CALayer: 0x7172d70>>

tanb

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
    NSLog(@"%@", [view performSelector:NSSelectorFromString(@"recursiveDescription")]);
#pragma clang diagnostic pop

tanb

$ brew install ruby
$ gem install cocoapods
$ gem env

add /usr/local/Cellar/ruby/2.0.0-p0/bin to $PATH

$ pod setup