Jiramot.info » Tutorial

Crop UIImage in UIScrollview

admin — Thu, 20 Oct 2011 12:39:32 +0000

    CGSize pageSize = myScrollView.frame.size;
    UIGraphicsBeginImageContext(pageSize);
    CGContextRef resizedContext = UIGraphicsGetCurrentContext();
    int offsetX = -1*myScrollView.contentOffset.x;
    int offsetY = -1*myScrollView.contentOffset.y;
    CGContextTranslateCTM(resizedContext, offsetX, offsetY);
    [myScrollView.layer renderInContext:resizedContext];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

How to check internet connection in iOS

admin — Wed, 21 Sep 2011 15:43:20 +0000

Here is its usage:

if ([Connection isConnected]) {  ...  }
else {  ...  }

//
//  Connection.h
//  iBlog
//
//  Created by Ondrej Rafaj on 12.11.09.
//  Copyright 2009 Home. All rights reserved.
//
#import 
#import 
#import 
#import 
#import   

@interface Connection : NSObject {  

}  

+ (BOOL) isConnected;  

@end

//
//  Connection.m
//  iBlog
//
//  Created by Ondrej Rafaj on 12.11.09.
//  Copyright 2009 Home. All rights reserved.
//  

#import "Connection.h"  

@implementation Connection  

+ (BOOL) isConnected {
    // Create zero addy
    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;
    // Recover reachability flags
    SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
    SCNetworkReachabilityFlags flags;
    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);
    if (!didRetrieveFlags) {
        NSLog(@"Error. Could not recover network reachability flags");
        return NO;
    }
    BOOL isReachable = flags & kSCNetworkFlagsReachable;
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
    BOOL nonWiFi = flags & kSCNetworkReachabilityFlagsTransientConnection;
    NSURL *testURL = [NSURL URLWithString:@"http://www.google.com/"];
    NSURLRequest *testRequest = [NSURLRequest requestWithURL:testURL  cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:20.0];
    NSURLConnection *testConnection = [[[NSURLConnection alloc] initWithRequest:testRequest delegate:self] autorelease];
    return ((isReachable && !needsConnection) || nonWiFi) ? (testConnection ? YES : NO) : NO;
}  

@end

Don’t forgot to include SystemConfiguration and libz.1.1.3.dylib
Download Here

Thanks Ondrej Rafaj for make this

Force change UI orientation

admin — Wed, 21 Sep 2011 15:33:59 +0000

This method link a toggle function to change between lanscape to protrait

 if(UIInterfaceOrientationIsPortrait(self.interfaceOrientation)){
        [[UIDevice currentDevice] setOrientation:UIInterfaceOrientationLandscapeRight];
    }else{
        [[UIDevice currentDevice] setOrientation:UIInterfaceOrientationPortrait];
    }

How to add extra font to iOS

admin — Wed, 21 Sep 2011 15:26:50 +0000

1. import font into xcode project
2. add UIAppFonts properties into info.plist with your file name of your font eg ‘filename.tlf’
3. Use the font name like iOS font system

UIFont *font = [UIFont fontWithName: @"Font Name" size: 60];
_textLabel.font = font;

Adding background image to UINavigationBar

admin — Wed, 21 Sep 2011 15:23:18 +0000

Create the class that override UINavigationBar and override drawRect function like this.

@implementation UINavigationBar (UINavigationBarCategory)
- (void)drawRect:(CGRect)rect {
    UIColor *color = [UIColor orangeColor];
    UIImage *img  = [UIImage imageNamed: @"nav_bar.png"];
    [img drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
    self.tintColor = color;
    [super drawRect: rect];
}

@end

Also, for the next we want to change text in the title

    CGRect frame = CGRectMake(0, 0, 200, 44);
    UILabel *label = [[[UILabel alloc] initWithFrame:frame] autorelease];

    label.backgroundColor = [UIColor clearColor];
    label.font = [UIFont systemFontOfSize:18];

    label.textAlignment = UITextAlignmentCenter;
    label.textColor = [UIColor blackColor];
    self.navigationItem.titleView = label;
    label.text = @"First View";

Enjoy.

PHP APNS: Apple Push Notification Service

admin — Sat, 03 Sep 2011 18:53:22 +0000

 $message);
if ($badge)
$body['aps']['badge'] = $badge;
if ($sound)
$body['aps']['sound'] = $sound;
/* End of Configurable Items */
$ctx = stream_context_create();
stream_context_set_option($ctx, 'ssl', 'local_cert', 'ck.pem');
// assume the private key passphase was removed.
// stream_context_set_option($ctx, 'ssl', 'passphrase', $pass);
$fp = stream_socket_client('ssl://gateway.sandbox.push.apple.com:2195', $err, $errstr, 60, STREAM_CLIENT_CONNECT, $ctx);
if (!$fp) {
	print "Failed to connect $err $errstrn";
	return;
} else {
	print "Connection OKn";
}
$payload = json_encode($body);
$msg = chr(0) . pack("n",32) . pack('H*', str_replace(' ', '', $deviceToken)) . pack("n",strlen($payload)) . $payload;

print "sending message :" . $payload . "n";
fwrite($fp, $msg);
fclose($fp);
?>

iPhone: a little work

admin — Tue, 30 Aug 2011 20:36:12 +0000

เอาไว้ scroll uitableview ไปข้างบน

[tableview scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];

เวลา scroll แล้วช้า ก็อาจจะลองทำแบบนี้
โดยการใช้ UIScrollViewDelegate เมื่อเรา Scroll ลงไป แล้วหยุด ก็ให้ไปโหลดรูปมาใหม่

#pragma mark -
#pragma mark Deferred image loading (UIScrollViewDelegate)

// Load images for all onscreen rows when scrolling is finished
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{

    if(!decelerate)
    {
        NSLog(@"scrollViewDidEndDragging ");
        [self loadImagesForOnscreenRows];
    }
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"scrollViewDidEndDecelerating");
    [self loadImagesForOnscreenRows];
}

- (void)loadImagesForOnscreenRows
{
    if ([recipes count] > 0)
    {
        NSArray *visiblePaths = [self.recipeTableView indexPathsForVisibleRows];
        for (NSIndexPath *indexPath in visiblePaths)
        {
            Recipe *recipe = [recipes objectAtIndex:indexPath.row];
            RecipeTableViewCell *recipeCell = [self.recipeTableView cellForRowAtIndexPath:indexPath];
//            recipeCell.imageView.image = [UIImage imageWithData:recipe.smallImageData] ;
            int pix = indexPath.row % 2;
            pix++;
            NSString* tmp = [NSString stringWithFormat:@"id_%d_L.png", pix];
            recipeCell.imageView.image = [UIImage imageNamed:tmp];
        }
    }
}

Android ListView in ScrollView Problem

admin — Wed, 06 Jul 2011 14:27:26 +0000

This is the method to re-calculate listview height to fix the problem.

public static void setListViewHeightBasedOnChildren(ListView listView) {
		ListAdapter listAdapter = listView.getAdapter();
		if (listAdapter == null) {
			// pre-condition
			return;
		}
 
		int totalHeight = 0;
		int desiredWidth = MeasureSpec.makeMeasureSpec(listView.getWidth(), MeasureSpec.AT_MOST);
		for (int i = 0; i < listAdapter.getCount(); i++) {
			View listItem = listAdapter.getView(i, null, listView);
			listItem.measure(desiredWidth, MeasureSpec.UNSPECIFIED);
			totalHeight += listItem.getMeasuredHeight();
		}
 
		ViewGroup.LayoutParams params = listView.getLayoutParams();
		params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
		listView.setLayoutParams(params);
		listView.requestLayout();
 
	}

Recursively delete .svn directories

admin — Thu, 07 Apr 2011 12:24:59 +0000

rm -rf `find . -type d -name .svn`

Android requires compiler compliance level 5.0. Please fix project properties.

admin — Thu, 31 Mar 2011 09:34:29 +0000

I believe that Android is talking about the Java bytecode format, which you can set in "Window/Preferences", "Java/Compiler/Compiler Compliance Level".