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Chris Dzombak cdzombak

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cdzombak / keyboard-autolayout.m
Last active Aug 29, 2015
iOS Keyboard Avoiding with Auto Layout
View keyboard-autolayout.m
// in -loadView or similar…
self.completeButtonBottomConstraint = [NSLayoutConstraint constraintWithItem:self.completeButton attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:v attribute:NSLayoutAttributeBottom multiplier:1.0 constant:-1.0*IDPCompleteButtonBottomSpacing];
// in -viewWillAppear:…
[NSNotificationCenter.defaultCenter addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[NSNotificationCenter.defaultCenter addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
- (void)keyboardWillShow:(NSNotification *)note {
[self updateBottomConstraintFromNotification:note];
cdzombak /
Last active Aug 29, 2015
an executive summary of my ever-forthcoming "error handling in swift 2" blog post.
  • throws in Swift 2 is just another way to return from a function/method. Because of its propagation semantics, it's not really "exceptions", which is probably a good change.
  • But unlike an Either or Result return type, throws in Swift 2 cannot communicate type information.
  • This sucks; and we will realize it sucks when we keep having to refer to documentation every time we call a function that throws to see what sort of errors we may have to handle. This is part of the problem that types solve; they are documentation, with compiler-enforced guarantees.
  • Arguments based on the clunkiness of pattern-matching on a Result type vs. the new syntax are not valid. Had the Swift team chosen to introduce a blessed stdlib Result type, they could have introduced elegant syntax to handle it without requiring boilerplate; remember, everything related to throws is new syntax.
  • Yes, this would make versioning harder. Changing the types of errors you return changes the contract of an API, if you care abou
cdzombak / Drop Action.scpt
Created Jun 3, 2015
OmniFocus AppleScript to move an action to my " Dropped" context and mark it completed.
View Drop Action.scpt
property droppedContext : "Dropped"
tell application "OmniFocus"
tell front document
set theDroppedContextID to id of item 1 of (complete droppedContext as context)
set theDroppedContext to first flattened context whose id is theDroppedContextID
on error
display alert "No context found whose name contains “" & droppedContext & ""
cdzombak / NSArray.h
Last active Aug 29, 2015
NSArray thought experiment. This code may not compile and there may be subtle bugs/inconsistencies. But this serves to illustrate the possible solution outlined in .
View NSArray.h
@protocol NSArray
+ (instancetype)array;
+ (instancetype)arrayWithObject:(id)anObject;
+ (instancetype)arrayWithObjects:(const id [])objects count:(NSUInteger)cnt;
+ (instancetype)arrayWithObjects:(id)firstObj, ... NS_REQUIRES_NIL_TERMINATION;
+ (instancetype)arrayWithArray:(NSArray *)array;
- (instancetype)initWithObjects:(id)firstObj, ... NS_REQUIRES_NIL_TERMINATION;
- (instancetype)initWithArray:(NSArray *)array;
View block-verify.m
NYTCompletionBlock completion = ^(id result) {};
id completionMock = [OCMockObject partialMockForObject:completion];
[[[completionMock expect] copy] andReturn:completion];
id sut = [[NYTXXX alloc] initWithCompletion:completionMock];
#pragma unused (sut)
[completionMock verify];
View CDZWeak.h
// CDZWeak.h
// Created by Chris Dzombak on 3/22/15.
// Copyright (c) 2015 Chris Dzombak. All rights reserved.
#ifndef CDZWeak_h
#define CDZWeak_h
View CDZIdioms.h
// CDZIdioms.h
// Created by Chris Dzombak on 3/21/15.
// Copyright (c) 2015 Chris Dzombak. All rights reserved.
#ifndef CDZIdioms_h
#define CDZIdioms_h
cdzombak / lazy_get.m
Created Feb 27, 2015
simple ObjC lazy getter macro
View lazy_get.m
#import <Foundation/Foundation.h>
#define lazy_get(TYPE, NAME, VALUE) \
@synthesize NAME = _##NAME; \
- (TYPE)NAME { if (!_##NAME) _##NAME = (VALUE); return _##NAME; }
// example usage follows:
@interface LazyThing : NSObject
cdzombak / as.m
Created Feb 26, 2015
swift-style as in ObjC
View as.m
#import <Foundation/Foundation.h>
#define as_checked(EXPR, KLASS) ({ id _obj = EXPR; NSCAssert([_obj isKindOfClass:[KLASS class]], @"Cannot cast %@ to %@", NSStringFromClass([_obj class]), NSStringFromClass([KLASS class])); _obj; })
#define as_option(EXPR, KLASS) ({ id _obj = EXPR; if (![_obj isKindOfClass:[KLASS class]]) _obj = nil; _obj; })
@interface NSObject(As)
- (instancetype)asChecked:(Class)klass;
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