objective-c

问题 I wanted to get an image of the screen, ignoring my app's window. Found a code example in Objective-C and tried to convert it to Swift. Objective-C snipped: // Get onscreen windows CGWindowID windowIDToExcude = (CGWindowID)[myNSWindow windowNumber]; CFArrayRef onScreenWindows = CGWindowListCreate(kCGWindowListOptionOnScreenOnly, kCGNullWindowID); CFMutableArrayRef finalList = CFArrayCreateMutableCopy(NULL, 0, onScreenWindows); for (long i = CFArrayGetCount(finalList) - 1; i >= 0; i--) {

问题 I wanted to get an image of the screen, ignoring my app's window. Found a code example in Objective-C and tried to convert it to Swift. Objective-C snipped: // Get onscreen windows CGWindowID windowIDToExcude = (CGWindowID)[myNSWindow windowNumber]; CFArrayRef onScreenWindows = CGWindowListCreate(kCGWindowListOptionOnScreenOnly, kCGNullWindowID); CFMutableArrayRef finalList = CFArrayCreateMutableCopy(NULL, 0, onScreenWindows); for (long i = CFArrayGetCount(finalList) - 1; i >= 0; i--) {

问题 I'm using xpath and LibXML in an iPhone app to find some nodes in an xml document. I'm a noob in xpath so probably i am doing something wrong. Here is the xml: <?xml version="1.0" encoding="utf-8"?> <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <soap:Body> <GetUserByEmailResponse xmlns="http://tempuri.org/"> <GetUserByEmailResult> <id>4006</id> <name>Kudor Gyozo</name>

问题 I'm using xpath and LibXML in an iPhone app to find some nodes in an xml document. I'm a noob in xpath so probably i am doing something wrong. Here is the xml: <?xml version="1.0" encoding="utf-8"?> <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <soap:Body> <GetUserByEmailResponse xmlns="http://tempuri.org/"> <GetUserByEmailResult> <id>4006</id> <name>Kudor Gyozo</name>

问题 Here is the full program. Can you figure out its console output? #import <Foundation/Foundation.h> #define kEnv YES #if kEnv #define x @"abc" #else #define x @"xyz" #endif #define kVersion true #if kVersion #define y @"abc" #else #define y @"xyz" #endif int main(int argc, const char * argv[]) { @autoreleasepool { NSLog(@"x: %@; y: %@", x, y); NSLog(@"%@", kEnv ? @"abc" : @"cba"); NSLog(@"%@", kVersion ? @"abc" : @"cba"); } return 0; } Before moving forward, you can copy & paste, run, and

问题 Here is the full program. Can you figure out its console output? #import <Foundation/Foundation.h> #define kEnv YES #if kEnv #define x @"abc" #else #define x @"xyz" #endif #define kVersion true #if kVersion #define y @"abc" #else #define y @"xyz" #endif int main(int argc, const char * argv[]) { @autoreleasepool { NSLog(@"x: %@; y: %@", x, y); NSLog(@"%@", kEnv ? @"abc" : @"cba"); NSLog(@"%@", kVersion ? @"abc" : @"cba"); } return 0; } Before moving forward, you can copy & paste, run, and

问题 I'm trying to send push notification for iOS via Google cloud functions but it returns error that The provided registration token is not registered . But I've checked it by debugging my app and the FCM registration token is correct. After that I've tried to send push notification via Firebase console to single device by providing FCM token but it failed due to Unregistered registration token . How this happens because there is no issue with device FCM token? 回答1: I think it should be some

问题 When I am trying to connect a UILabel in a UICollectionViewCell that has been declared as @property (nonatomic, weak) IBOutlet UILabel *Title; It shows that: Outlet cannot be connected to repeating content. I have done some search and find out that I need to use some kinds of connection of the outlet between UIView and the UICollectionView. But I do not understand what to do exactly. So how could I make such a connection so that UILabel in the UICollectionViewCell can be accessed? 回答1: You

问题 When I am trying to connect a UILabel in a UICollectionViewCell that has been declared as @property (nonatomic, weak) IBOutlet UILabel *Title; It shows that: Outlet cannot be connected to repeating content. I have done some search and find out that I need to use some kinds of connection of the outlet between UIView and the UICollectionView. But I do not understand what to do exactly. So how could I make such a connection so that UILabel in the UICollectionViewCell can be accessed? 回答1: You

问题 Given #define LOG_OBJECT(object) (NSLog(@"" #object @" %@ %@:%d”, [object description], [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __LINE__)); The statement LOG_OBJECT(self); will produce: 2014-07-18 17:43:30.041 FrogCamera[12484:2144843] self ViewController.m:20 I wish to understand how the preprocessor code works. How can I see the statement that the pre processor produced? Specifically: Why the whole #define statement is wrapped in ( ) ? Is #object a text replacement for