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    if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad) { // iPad
        if ([UIPopoverPresentationController class]) { // iOS8
            avc.modalPresentationStyle = UIModalPresentationPopover;
            UIPopoverPresentationController *ppc = avc.popoverPresentationController;
            //ppc.permittedArrowDirections = UIPopoverArrowDirectionAny;
            ppc.barButtonItem = self.shareButtonItem; // self.toolbarItems.lastObject;
            //ppc.sourceRect = self.navigationController.toolbar.frame;
            //ppc.sourceView = self.navigationController.toolbar;
        } else {
            self.myPopoverController = [[UIPopoverController alloc] initWithContentViewController:avc];

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// You'll also need the QuartzCore framework added to the project
#import <QuartzCore/QuartzCore.h>

int x = 0; int y = 0;
int toX = 30; int toY = 40;
CGMutablePathRef linePath = CGPathCreateMutable();
CGPathMoveToPoint(linePath, NULL, x, y);
CGPathAddLineToPoint(linePath, NULL, toX, toY);

CAShapeLayer *lineShape = [CAShapeLayer layer];

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- (void)reEncodingTextFileAtUrl:(NSURL*)url{
    NSString * str = nil;
    NSStringEncoding fileEncoding = 0;
    NSError * __autoreleasing error;

    if (![url checkResourceIsReachableAndReturnError:&error]) { // 非必须
        NSLog(@"not reachable: %@", error.localizedDescription);
        return;
    }
    // 自动获取编码，但探测的编码范围公限于CFString.h头文件里提到的编码

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BlocksKit对原有代码有影响，会导致不用block而用delegate的实现出问题。已经发现不止一次这个缺陷引起的崩溃了。
1. 比如textview点某个词出现系统预置菜单后，点“添加”，会导致“添加”界面的textField意外无限递归而崩溃。
这个问题很恶心啊。设计blocks的时候，似乎没考虑到这点。
2. UIImagePickerViewController的delegate方法必须全实现，否则未选照片时就不能退回。

个人怀疑根源跟method swizzling有关。考虑到method swizzling不被苹果允许，我考虑将项目里的blocksKit相关的代码全删掉。这是无奈之举。毕竟blocksKit确实很优秀。

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$ security find-identity -p codesigning

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$(ARCHS_STANDARD) 从Xcode6之后，armv7s被弃，后者用于iPhone5和5c，而从5s之后就全面转向arm64


查看库或可执行文件支持的arch，file $fileName, 或lipo -info $fileName，例如，

$ lipo -info ESecure
Architectures in the fat file: ESecure are: armv7 arm64 

$ file ESecure
ESecure: Mach-O universal binary with 2 architectures

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// UIColor+InverseColor.h
@interface UIColor(InverseColor)
- (UIColor*)inverseColor;
@end

// UIColor+InverseColor.m
@implement UIColor(InverseColor)
- (UIColor*)inverseColor {
    CGColorRef oldCGColor = self.CGColor;
    NSInteger numOfComponents = CGColorGetNumberOfComponents(oldCGColor);

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file content.

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*** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-3347.44.2/UITableView.m:1222

if continue to run, get this message, CoreData: error: Serious application error. An exception was caught from the delegate of NSFetchedResultsController during a call to -controllerDidChangeContent:. attempt to delete and reload the same index path (<NSIndexPath: 0xc000000000018016> {length = 2, path = 0 - 3}) with userInfo (null)

Related code, as follows,

- (void)controllerWillChangeContent:(NSFetchedResultsController*)controller {

acalism

Pretty-printing JSON and XML on Mac OSX

Like my colleagues at Avisi I’m an avid OSX user. One of the reasons I like OSX is it gives you the power of Unix right under your fingertips while still providing a nice user interface. 
Now suppose you’re working on RESTful services and you need to verify or debug some JSON output. Digging through an unformatted JSON string can be a real pain. To make a JSON string human readable open up the Terminal and type:
 cat unformatted.json | python -m json.tool > formatted.json
This will pretty-print the contents of “unformatted.json” to a new file called “formatted.json”. For this to work you need to have at least Python 2.6 installed. Which is the case when your running Snow Leopard or higher.
The above command assumes you have a file containing the JSON content. When you’re debugging it’s more likely you copied a JSON string to your clipboard from a (remote) log file. To pretty-print the JSON content on your clipboard type:
pbpaste | python -m json.tool > formatted.json
L