
我正在尝试将CardView添加到我的活动中作为官方样本.但它不起作用.
如果我直接运行我的项目,它将导致java.lang.ClassNotFoundException:android.support.v7.widget.CardView.
UIView.animateWithDuration(1,
animations: { [unowned self] in
self.box.center = self.boxTopRightPosition
},
completion: { [unowned self] completed in
self.box.hidden = true
})
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是否有必要避免内存泄漏?
在HMSegmentedControl,我想设置segmentedControl.indexChangeBlock一个实例方法来处理动作.官方的例子是:https://github.com/HeshamMegid/HMSegmentedControl/blob/master/HMSegmentedControlExample/HMSegmentedControlExample/ViewController.m(第63~68行),但这是Objective-C.
在斯威夫特,功能是一等公民.所以我想为这个块属性设置一个实例方法.
但是我的代码会导致循环引用,似乎我应该定义一个弱引用:
class ExampleVC: UIViewController {
var segmentedControlIndex: Int = 0
override func viewDidLoad() {
let segmentedControl3 = HMSegmentedControl(sectionImages: ... , sectionSelectedImages: ... )
segmentedControl3.frame = ...
segmentedControl3.indexChangeBlock = someInstanceMethod
}
func someInstanceMethod(index: Int) {
segmentedControlIndex = index
}
}
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但是,我无法定义对非类类型的弱引用.我能做什么?这样做是否合法?
在 Combine 框架中,我们可以Error在使用tryMap.
但是,我们如何才能更具体地了解Error类型?
例如,
let publisher = urlSession.dataTaskPublisher(for: request).tryMap { (data, response) -> (Data, HTTPURLResponse) in
guard let response = response as? HTTPURLResponse else {
throw URLError(.cannotParseResponse)
}
return (data, response)
}
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如何指定Errorthis的类型publisher?我想使用URLError而不是Error.
我setFailureType(to:)在Combine框架中找到了方法。但是,它不适用于tryMap(_:).
正如众所周知,AFHTTPSessionManager在AFNetworking 2.0+支持Cookie.
但是,它可能AFHTTPRequestOperationManager在AFNetworking 2.0+支持cookies吗?
brew install php55
==> Downloading http://www.php.net/get/php-5.5.11.tar.bz2/from/this/mirror
######################################################################## 100.0%
Error: SHA256 mismatch
Expected: 60e14c255f2a461a7a26639b84a2fc448cc2f91c8dead0e9fd00cd8ba27a2e96
Actual: 0d9438c2557db5809f4232148ca1567516e7ece9bf8726853ceac4a111cb8690
Archive: /Library/Caches/Homebrew/php55-5.5.11
To retry an incomplete download, remove the file above.
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我试过了
brew cleanup && brew update
但没有奏效
$ sudo go get -u github.com/golang/lint/golint
package github.com/golang/lint/golint: cannot download, $GOPATH not set. For more details see: go help gopath
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我设置了我的$ GOPATH :(在~/.bash_profile我的Mac上)导出GOPATH = $ HOME/gocode
我的go env:
$ go env
GOARCH="amd64"
GOBIN=""
GOCHAR="6"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/wildcat/gocode"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fno-common"
CXX="g++"
CGO_ENABLED="1"
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有什么问题?
我尝试了很多样式来改变动作栏的颜色,但没有奏效.
这是我的风格:
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="actionBarStyle">@style/AppTheme.ActionBarStyle</item>
</style>
<style name="AppTheme.ActionBarStyle" parent="Widget.AppCompat.ActionBar.Solid">
<item name="android:background">#f01234</item>
</style>
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我的模拟器版本:Android 4.2