ddeville
/ gist:1186439
Created
September 1, 2011 15:38
Recursively print UIView hierarchy for a particular view
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| - (void)printViewHierarchy:(UIView *)view | |
| { | |
| if (view == nil) | |
| return; | |
| NSLog(@"%@", view); | |
| for (UIView *subview in [view subviews]) | |
| { | |
| [self printViewHierarchy: subview]; |
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| #if TARGET_OS_IPHONE | |
| #import <MobileCoreServices/MobileCoreServices.h> | |
| #else | |
| #import <CoreServices/CoreServices.h> | |
| #endif | |
| /* | |
| MIME type to UTI | |
| */ | |
| NSURLResponse *response = ... // assume a URL response from somewhere else. |
ddeville
/ gist:5228224
Last active
December 15, 2015 08:08
— forked from joshaber/gist:5228077
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| @interface RetrievalOperation : NSOperation | |
| + (id)retrievalOperationWithBlock:(id (^)(void))block; | |
| @property (readonly, strong, nonatomic) id result; | |
| @end | |
| @interface RetrievalOperation (/* Private */) | |
| @property (readwrite, strong, nonatomic) id result; | |
| @property (copy, nonatomic) id (^block)(void); | |
| @end |
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| @interface SomeViewController : UIViewController | |
| @end | |
| @implementation SomeViewController | |
| - (IBAction)show:(id)sender | |
| { | |
| UIImagePickerController *pickerController = [UIImagePickerController new]; | |
| [pickerController setDelegate:(id)self]; |
ddeville
/ ruby-nil-messaging-objc.m
Created
June 28, 2013 14:00
Ruby-like nil messaging in Objective-C
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| // | |
| // Created by Damien DeVille on 6/23/13. | |
| // Copyright (c) 2013 Damien DeVille. All rights reserved. | |
| // | |
| #import <Foundation/Foundation.h> | |
| #import <objc/runtime.h> | |
| extern id _objc_setNilReceiver(id newNilReceiver); | |
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| rax - accumulator | |
| rbx - base | |
| rcx - count | |
| rdx - data | |
| r8-15 | |
| rsi - source index | |
| rdi - destination index | |
| rbp - base pointer |
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| So: | |
| id boxedValue = objc_msgSend(self, mappingSelector, instance, value, boxingParameters); | |
| would become: | |
| id boxedValue = ((id (*)(id, SEL, id, id, id))objc_msgSend)(self, mappingSelector, instance, value, boxingParameters); | |
| The first `id` and `SEL` are basically `self` and `_cmd`, the first 2 arguments in any objc_msgSend. |
ddeville
/ gist:7097600
Created
October 22, 2013 09:21
The correct way to react to changes on observed objects.
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| // | |
| // main.m | |
| // KVO | |
| // | |
| // Created by Damien DeVille on 10/22/13. | |
| // Copyright (c) 2013 Damien DeVille. All rights reserved. | |
| // | |
| #import <Foundation/Foundation.h> |
ddeville
/ gist:7103822
Created
October 22, 2013 16:32
Think of a parent view controller that contains two children view controllers. The title of the parent view controller is a mixture of the titles of its children. The title of the second view controller depends on the name of its represented object too. Now, one would only need to bind the title of the window (for example) to the parent view con…
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| @interface ParentViewController : NSViewController | |
| @property (strong, nonatomic) FirstChildViewController *firstViewController; | |
| @property (strong, nonatomic) SecondChildViewController *secondViewController; | |
| @end | |
| @implementation ParentViewController |
ddeville
/ gist:7169443
Last active
December 26, 2015 14:59
+keyPathsForValuesAffectingValueForKey: vs +keyPathsForValuesAffecting<Key>.
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| // | |
| // main.m | |
| // KVO | |
| // | |
| // Created by Damien DeVille on 10/26/13. | |
| // Copyright (c) 2013 Damien DeVille. All rights reserved. | |
| // | |
| #import <Foundation/Foundation.h> |
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