我有一个网络方法,返回一个完成闭包,带有一个Error参数.
我通常会避免强行展开,但在这种情况下,我会使用一个guard语句来检查是否error不是nil:
guard error == nil else {
print(error!)
return
}
...
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我正在调用的方法来自SDK,所以我真的不知道那里发生了什么.
一般情况下,这种力量解开线程是否安全?
我需要一些帮助,如何在React js中匹配密码。我使用ant设计,第一个密码有效,但是对于一致密码,我声明不起作用,该怎么办
handlePasswordChange = event => {
this.setState({
password: event.target.value,
});
};
handleConfirmPassword = event => {
if (event.handleConfirmPassword !== event.handlePasswordChange) {
message.error('error');
}
};
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这些很有趣,下面是蚂蚁设计
<FormItem {...styles.formItemLayout} label="Password">
{getFieldDecorator('Password', {
rules: [{ required: true, message: 'Password is Required!' }],
})(
<Input
onChange={this.handlePasswordChange}
name="password"
type="password"
value={password}
style={styles.margin}
/>,
)}
</FormItem>
<FormItem {...styles.formItemLayout} label="Confirm Password">
{getFieldDecorator('Confirm Password', {
rules: [{ required: true, message: 'Confirm your Password!' }],
})(
<Input
name="password"
type="password"
style={styles.margin}
onChange={this.handleConfirmPassword}
/>,
)}
</FormItem>
Run Code Online (Sandbox Code Playgroud) 在C&中Objective C,我们用于取消引用指针并获取如下值:
p->a = 1
or int x = p->a
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但是我找不到Swift中的等价物.我有一个返回类型UnsafePointer ,AudioStreamBasicDescription?我需要读取其成员值.
我将其Locksmith用作 Swift 的钥匙串包装器,但在尝试保存数据时显示以下错误
The operation couldn’t be completed. (Locksmith.LocksmithError error 3.)
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这是我试图将数据保存到钥匙串的代码
let datapair = ["Content": "value"]
do {
try Locksmith.saveData(data: datapair, forUserAccount: "key")
} catch let error {
print(error.localizedDescription)
}
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任何解决方案或建议都应受到赞赏
我有一个叫做的罐子a.jar.当我执行它时,java -jar a.jar一切正常.但是当我创建这个.command文件时:
#!/bin/bash
java -jar a.jar
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chmod u+x launch.command通过双击执行并运行它,终端窗口显示
Error: Unable to access jarfile a.jar
Run Code Online (Sandbox Code Playgroud) 集合视图中有多个图像可以正常工作。像这样显示
但是我想这样表演
这是集合视图单元格的代码
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsets(top: 10, left: 0, bottom: 20, right: 0)
let width = UIScreen.main.bounds.width
layout.itemSize = CGSize(width: width/2 , height: width/2 )
layout.minimumInteritemSpacing = 0
layout.minimumLineSpacing = 0
collectionView!.collectionViewLayout = layout
Run Code Online (Sandbox Code Playgroud) 当我运行以下代码时:
class Startup(被称为main()):
import java.util.ArrayList;
public class Startup {
public void start() {
// Build rooms
final int WIDTH = 2;
final int HEIGHT = 2;
Room[][] room = new Room[WIDTH][HEIGHT];
Rooms.build(room, WIDTH, HEIGHT);
int x = 0;
int y = 0;
// Print starting room description
Rooms.print(room, x, y);
// Start game loop
boolean playing = true;
while (playing) {
// Get user input
String input = Input.getInput();
System.out.println(input);
// Movement commands
if (input.equals("n")) {
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