小编hpi*_*que的帖子

我想在我的Android应用程序中处理pinch事件以放大和缩小.

我相信Android 2.0具有多点触控功能,并且听说Android 1.6可能支持也可能不支持它,具体取决于设备.

检测夹点事件的最佳方法是什么,而对于不支持它的设备则优雅地降级？我的目标是Android 1.5向上.

在Java中,如何确定String是否与格式字符串匹配(即:)song%03d.mp3？

换句话说,您将如何实现以下功能？

/**
* @return true if formatted equals String.format(format, something), false otherwise.
**/
boolean matches(String formatted, String format);

例子:

matches("hello world!", "hello %s!"); // true
matches("song001.mp3", "song%03d.mp3"); // true
matches("potato", "song%03d.mp3"); // false

也许有一种方法可以将格式字符串转换为正则表达式？

澄清

格式String是一个参数.我不提前知道.song%03d.mp3只是一个例子.它可以是任何其他格式字符串.

如果有帮助,我可以假设格式字符串只有一个参数.

如果我理解正确,a的内容UICollectionViewCell应该进入其contentView属性和背景backgroundView.

然而,当我拖动UICollectionViewCell到Interface Builder时,没有提到contentView或backgroundView.如果我添加子视图,那些将整个单元格作为其父级,而不是contentView或backgroundView.

那么UICollectionViewCell用IB 定义一个正确的方法是什么？

以下Swift代码在构建时生成编译错误:

import Foundation

class Wrapper<T> : NSObject {
    let obj : T

    init(x : T) {
        self.obj = x
    }
}

我做错了什么或这是编译错误？

如果是这样,我该怎么做才能解决它？

错误日志:

CompileSwift normal i386 com.apple.xcode.tools.swift.compiler
    cd /Users/hermespique/workspace/HanekeSwift
    export PATH="/Applications/Xcode6-Beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode6-Beta.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -target i386-apple-ios8.0 -module-name HanekeTests -O0 -sdk /Applications/Xcode6-Beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.0.sdk -g -module-cache-path /Users/hermespique/Library/Developer/Xcode/DerivedData/ModuleCache -I /Users/hermespique/Library/Developer/Xcode/DerivedData/Haneke-dsgqpxenngbaqpctbkhhwtqbiorj/Build/Products/Debug-iphonesimulator -F /Users/hermespique/Library/Developer/Xcode/DerivedData/Haneke-dsgqpxenngbaqpctbkhhwtqbiorj/Build/Products/Debug-iphonesimulator -F /Applications/Xcode6-Beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.0.sdk/Developer/Library/Frameworks -F /Applications/Xcode6-Beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Frameworks -F /Applications/Xcode6-Beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.0.sdk/Developer/Library/Frameworks -c -j4 /Users/hermespique/workspace/HanekeSwift/HanekeTests/XCTestCase+Assert.swift /Users/hermespique/workspace/HanekeSwift/HanekeTests/Cache.swift /Users/hermespique/workspace/HanekeSwift/HanekeTests/Wrapper.swift -output-file-map /Users/hermespique/Library/Developer/Xcode/DerivedData/Haneke-dsgqpxenngbaqpctbkhhwtqbiorj/Build/Intermediates/Haneke.build/Debug-iphonesimulator/HanekeTests.build/Objects-normal/i386/HanekeTests-OutputFileMap.json -serialize-diagnostics -emit-dependencies -emit-module -emit-module-path /Users/hermespique/Library/Developer/Xcode/DerivedData/Haneke-dsgqpxenngbaqpctbkhhwtqbiorj/Build/Intermediates/Haneke.build/Debug-iphonesimulator/HanekeTests.build/Objects-normal/i386/HanekeTests.swiftmodule -Xcc -iquote -Xcc /Users/hermespique/Library/Developer/Xcode/DerivedData/Haneke-dsgqpxenngbaqpctbkhhwtqbiorj/Build/Intermediates/Haneke.build/Debug-iphonesimulator/HanekeTests.build/HanekeTests-generated-files.hmap -Xcc -I/Users/hermespique/Library/Developer/Xcode/DerivedData/Haneke-dsgqpxenngbaqpctbkhhwtqbiorj/Build/Intermediates/Haneke.build/Debug-iphonesimulator/HanekeTests.build/HanekeTests-own-target-headers.hmap -Xcc -ivfsoverlay -Xcc /Users/hermespique/Library/Developer/Xcode/DerivedData/Haneke-dsgqpxenngbaqpctbkhhwtqbiorj/Build/Intermediates/Haneke.build/all-product-headers.yaml -Xcc -iquote -Xcc /Users/hermespique/Library/Developer/Xcode/DerivedData/Haneke-dsgqpxenngbaqpctbkhhwtqbiorj/Build/Intermediates/Haneke.build/Debug-iphonesimulator/HanekeTests.build/HanekeTests-project-headers.hmap -Xcc …

我想在视图控制器中显示MPMoviePlayerController,并让用户使用默认控件(如YouTube应用程序)切换全屏.我在一个简单的例子中使用以下代码:

- (void)viewDidLoad {
    [super viewDidLoad];
    self.player = [[MPMoviePlayerController alloc] init];
    self.player.contentURL = theURL;
    self.player.view.frame = self.viewForMovie.bounds;
    self.player.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    [self.viewForMovie addSubview:player.view];
    [self.player play];
}

这很有效,直到用户将视频全屏显示,旋转设备并点击屏幕.状态栏显示在错误的位置,如下面的屏幕截图所示.

我正在使用模板Tab Bar Application for iPad.我只添加了上面的viewDidLoad,视图变量和XIB中的UIView来显示电影播放器​​.

我究竟做错了什么？

Android 中System.setProperty的范围是什么？

如果我设置了一个属性(比如说System.setProperty("http.keepAlive", "false")),它是否会影响系统中的所有应用程序,当前应用程序,当前任务或当前线程？

这记录在哪里？

你如何获得Android设备的所有相机图像列表？

是通过MediaStore吗？怎么样？

我想按照其电子商务跟踪指南中的说明,使用Google Analytics SDK for iOS v2跟踪应用内购买情况.

我在收到SKPaymentTransactionStatePurchased事务更新后正在执行以下操作:

- (void) trackTransaction:(SKPaymentTransaction*)transaction
{
    NSString *transactionIdentifier = transaction.transactionIdentifier;
    GAITransaction *gaiTransaction = [GAITransaction transactionWithId:transactionIdentifier withAffiliation:@"App Store"];

    SKPayment *payment = transaction.payment;
    NSString *productIdentifier = payment.productIdentifier;
    SKProduct *product = [self productForIdentifier:productIdentifier];
    NSString *productTitle = product.localizedTitle;
    int64_t priceInMicros = product.price.floatValue * 1000000; // FIXME: Doesn't consider different currencies
    [gaiTransaction addItemWithCode:productIdentifier name:productTitle category:nil priceMicros:priceInMicros quantity:payment.quantity];

    gaiTransaction.revenueMicros = priceInMicros * payment.quantity; // FIXME: doesn't consider Apple's cut

    id<GAITracker> tracker = [GAI sharedInstance].defaultTracker;
    [tracker trackTransaction:gaiTransaction];
} …

你能用CSS制作圆帽下划线(如上图所示)吗？怎么样？

有没有办法做到这一点border-bottom？border-radius产生这种时尚效果:

Stack Overflow已经讨论了图像解压缩的问题,但直到这个问题还有0个提及kCGImageSourceShouldCacheImmediately,iOS 7中引入的一个选项理论上解决了这个问题.从标题:

指定图像解码和缓存是否应在图像创建时发生.

在Objc.io#7中, Peter Steinberger提出了这种方法:

+ (UIImage *)decompressedImageWithData:(NSData *)data 
{
    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
    CGImageRef cgImage = CGImageSourceCreateImageAtIndex(source, 0, (__bridge CFDictionaryRef)@{(id)kCGImageSourceShouldCacheImmediately: @YES});

    UIImage *image = [UIImage imageWithCGImage:cgImage];
    CGImageRelease(cgImage);
    CFRelease(source);
    return image;
}

像AFNetworking和SDWebImage这样的库仍然使用该CGContextDrawImage方法进行图像解压缩.来自SDWebImage:

+ (UIImage *)decodedImageWithImage:(UIImage *)image {
    if (image.images) {
        // Do not decode animated images
        return image;
    }

    CGImageRef imageRef = image.CGImage;
    CGSize imageSize = CGSizeMake(CGImageGetWidth(imageRef), CGImageGetHeight(imageRef));
    CGRect imageRect = (CGRect){.origin = CGPointZero, .size = imageSize};

    CGColorSpaceRef …