Cocoa Snippets

UIView with shadow

tableView.layer.shadowColor = [UIColor colorWithWhite:0 alpha:1].CGColor;

tableView.layer.masksToBounds = NO;

tableView.layer.shadowOffset = CGSizeMake(0, 1);

tableView.layer.shadowRadius = 10;

tableView.layer.shadowOpacity = .65f;

iPhone List of fonts for iOS SDK 4.3

Family name: Thonburi

Subtitles Wizard

Downloading subtitles has never been easier :)

at Mac App Store.

Remove scrollview bounce from UIWebView

for (id subview in webView.subviews)

if ([[subview class] isSubclassOfClass: [UIScrollView class]])

((UIScrollView *)subview).bounces = NO;

Remove HTML tags from a NSString

NSRange r;

NSString *strWithoutHTMLTags = [[str copy] autorelease];

while ((r = [strWithoutHTMLTags rangeOfString:@”<[^>]+>” options:NSRegularExpressionSearch]).location != NSNotFound)

strWithoutHTMLTags = [strWithoutHTMLTags stringByReplacingCharactersInRange:r withString:@”“];

UINavigationController pushViewController from landscape to portrait

Little hack…

At portrait view controller

- (void)viewDidLoad {

[super viewDidLoad];

if (UIInterfaceOrientationIsLandscape([[UIDevice currentDevice] orientation])) {

UIViewController *viewController = [[UIViewController alloc] init];

[self presentModalViewController:viewController animated:NO];

[self dismissModalViewControllerAnimated:NO];

[viewController release];

}

}

CALayer from UIImage

- (CALayer *)layerFromImageNamed:(NSString *)name { CALayer *imgLayer = [[CALayer alloc] init]; imgLayer.backgroundColor = [UIColor clearColor].CGColor; imgLayer.contentsGravity = kCAGravityResizeAspect; UIImage *img = [UIImage imageNamed:name]; imgLayer.contents = (id)img.CGImage; [imgLayer setFrame:CGRectMake(0, 0, img.size.width, img.size.height)]; return imgLayer; }

UITabBar background

CGRect frame = CGRectMake(0, 0, 480, 49);

    UIView *v = [[UIView alloc] initWithFrame:frame];

    UIImage *i = [UIImage imageNamed:@”redGradient.png”];

    UIColor *c = [[UIColor alloc] initWithPatternImage:i];

    v.backgroundColor = c;

    [c release];

    [tabBar insertSubview:v atIndex:0];

    [v release];

//or with color

UIColor *color = UIColorFromRGB(0xF42626);

CGRect frame = CGRectMake(0.0, 0.0, self.view.bounds.size.width, 48);

    UIView *v = [[UIView alloc] initWithFrame:frame];

    [v setBackgroundColor:color];

    [v setAlpha:0.5];

    [tabBar insertSubview:v atIndex:0];

    [v release];

Nice NSLog debugging

NSLog(@”%s %d %s”, __FILE__, __LINE__, __PRETTY_FUNCTION__);

Force autorotation

[[UIDevice currentDevice] setOrientation:[[UIDevice currentDevice] orientation]];

Singletons

+ (object*)sharedInstance

{

  static object* sharedInstance = nil;

  @synchronized (self) {

  if (sharedInstance == nil)

sharedInstance = [[object* alloc] init];

}

return sharedInstance;

}

Using XML

If you can ignore a little loss of performance and need a complete XML control with many output options, I recommend http://code.google.com/p/kissxml/

XML to NSDictionary

From: http://troybrant.net/blog/2010/09/simple-xml-to-nsdictionary-converter/

//
// XMLReader.h
//

#import <Foundation/Foundation.h>

@interface XMLReader : NSObject
{
    NSMutableArray *dictionaryStack;
    NSMutableString *textInProgress;
    NSError **errorPointer;
}

+ (NSDictionary *)dictionaryForXMLData:(NSData *)data error:(NSError **)errorPointer;
+ (NSDictionary *)dictionaryForXMLString:(NSString *)string error:(NSError **)errorPointer;

@end

//// XMLReader.m//

#import “XMLReader.h”

NSString *const kXMLReaderTextNodeKey = @”text”;

@interface XMLReader (Internal)

- (id)initWithError:(NSError **)error;- (NSDictionary *)objectWithData:(NSData *)data;

@end

@implementation XMLReader

#pragma mark -#pragma mark Public methods

+ (NSDictionary *)dictionaryForXMLData:(NSData *)data error:(NSError **)error{    XMLReader *reader = [[XMLReader alloc] initWithError:error];    NSDictionary *rootDictionary = [reader objectWithData:data];    [reader release];    return rootDictionary;}

+ (NSDictionary *)dictionaryForXMLString:(NSString *)string error:(NSError **)error{    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];    return [XMLReader dictionaryForXMLData:data error:error];}

#pragma mark -#pragma mark Parsing

- (id)initWithError:(NSError **)error{    if (self = [super init])    {        errorPointer = error;    }    return self;}

- (void)dealloc{    [dictionaryStack release];    [textInProgress release];    [super dealloc];}

- (NSDictionary *)objectWithData:(NSData *)data{    // Clear out any old data    [dictionaryStack release];    [textInProgress release];        dictionaryStack = [[NSMutableArray alloc] init];    textInProgress = [[NSMutableString alloc] init];        // Initialize the stack with a fresh dictionary    [dictionaryStack addObject:[NSMutableDictionary dictionary]];        // Parse the XML    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];    parser.delegate = self;    BOOL success = [parser parse];        // Return the stack’s root dictionary on success    if (success)    {        NSDictionary *resultDict = [dictionaryStack objectAtIndex:0];        return resultDict;    }        return nil;}

#pragma mark -#pragma mark NSXMLParserDelegate methods

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{    // Get the dictionary for the current level in the stack    NSMutableDictionary *parentDict = [dictionaryStack lastObject];        // Create the child dictionary for the new element, and initilaize it with the attributes    NSMutableDictionary *childDict = [NSMutableDictionary dictionary];    [childDict addEntriesFromDictionary:attributeDict];        // If there’s already an item for this key, it means we need to create an array    id existingValue = [parentDict objectForKey:elementName];    if (existingValue)    {        NSMutableArray *array = nil;        if ([existingValue isKindOfClass:[NSMutableArray class]])        {            // The array exists, so use it            array = (NSMutableArray *) existingValue;        }        else        {            // Create an array if it doesn’t exist            array = [NSMutableArray array];            [array addObject:existingValue];                        // Replace the child dictionary with an array of children dictionaries            [parentDict setObject:array forKey:elementName];        }                // Add the new child dictionary to the array        [array addObject:childDict];    }    else    {        // No existing value, so update the dictionary        [parentDict setObject:childDict forKey:elementName];    }        // Update the stack    [dictionaryStack addObject:childDict];}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{    // Update the parent dict with text info    NSMutableDictionary *dictInProgress = [dictionaryStack lastObject];        // Set the text property    if ([textInProgress length] > 0)    {        // Get rid of leading + trailing whitespace        [dictInProgress setObject:textInProgress forKey:kXMLReaderTextNodeKey];                // Reset the text        [textInProgress release];        textInProgress = [[NSMutableString alloc] init];    }        // Pop the current dict    [dictionaryStack removeLastObject];}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{    // Build the text value    [textInProgress appendString:string];}

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError{    // Set the error pointer to the parser’s error object    *errorPointer = parseError;}

@end

Change FaceBook share layout to fit UIWebView with JavaScript

[webView stringByEvaluatingJavaScriptFromString:

@”var metadata = document.createElement(‘meta’);”

“metadata.name = ‘viewport’;”

“metadata.content = ‘width=320’;”

“document.getElementsByTagName(‘head’)[0].appendChild(metadata);”

//margin top to text field, or else it would be behind photo

“document.getElementById(‘UIShareComposer_MessageLabel’).style.margin = ‘55px 0 0 0’;”];

[webView setScalesPageToFit:NO];

UIWebView Page Width by JavaScript

[webView stringByEvaluatingJavaScriptFromString:

@”var metadata = document.createElement(‘meta’);”

“metadata.name = ‘viewport’;”

“metadata.content = ‘width=320’;”

“document.getElementsByTagName(‘head’)[0].appendChild(metadata);”];

[webView setScalesPageToFit:YES];