我正在尝试将不透明度重置为1.0,用于"演示文本4",其容器的不透明度设置为0.3.我读到我可以直接使用:color:rgba(255,255,0,1); 但这对我不起作用.有没有办法实现我的目标?
<!DOCTYPE html>
<html lang="en">
<head>
<style>
#text_holder {
background: blue;
width: 500px;
height: 200px;
}
#text_holder2 {
background: blue;
width: 500px;
height: 200px;
color: rgba(255, 255, 0, 1);
}
#alpha_30 {
opacity: 0.3;
color: #ff0000;
}
#alpha_100 {
color: #ff0000;
}
</style>
</head>
<body>
<div id="alpha_100">
<div id="text_holder">
<p>Demo text 1</p>
</div>
</div>
<div id="alpha_30">
<div id="text_holder">
<p>Demo text 2</p>
</div>
</div>
<div id="alpha_30">
<div id="text_holder">
<p>Demo text 3</p>
</div>
<div id="text_holder2">
<p>Demo text 4</p>
</div>
</div>
</body> …Run Code Online (Sandbox Code Playgroud) Angular Hero Editor的教程指出,要为HeroesComponent添加一个名为"Windstorm"的英雄的英雄属性,你应该编辑heroes.component.ts并添加:hero ='Windstorm';
但是,它没有说明应该放置代码的位置.
我应该在哪里将代码添加到文件中?以下是文件的内容:
import { Component, OnInit } from '@angular/core';
@Component({
selector: 'app-heroes',
templateUrl: './heroes.component.html',
styleUrls: ['./heroes.component.css']
})
export class HeroesComponent implements OnInit {
constructor() {
}
ngOnInit() {
}
}
Run Code Online (Sandbox Code Playgroud) 我在Mac上使用QuickTime Player 10创建屏幕录像。是否可以设置电影的尺寸或需要拍摄的位置?我必须使用精确的屏幕尺寸和位置来制作多部电影。
我正在学习 Git 并进行实验。我了解如何进行基本操作,但正在努力创建一个新分支。我在 Windows 中使用命令提示符,在浏览器中使用 github 工具。我试图通过在浏览器中创建一个新分支(名为 branch_1)来模拟新分支的创建,但是当我尝试在命令提示符中找到该分支时,它没有出现。例如,这是我在命令提示符中得到的内容:
git branch
_notes/dwsync.xml
master
v1.1
v1.2
v1.3
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如何让新分支出现?
我一直在观看一个视频,声明UIAlertView只有在导入UIKit.h时才有效.但是,如果我在头文件中注释掉import语句:
//#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
@end
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当我将其添加到实现文件时,警报仍然有效:
- (void)viewDidLoad
{
[super viewDidLoad];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Title" message:@"Message" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alert show];
}
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请解释为什么这有效?UIKit的真正作用是什么?
我以为我终于设法了解委托的概念,直到发生以下情况:我更改了我的头文件以删除对委托的引用,并且警报仍然有效.唯一的区别是我丢失了代码提示.
//.h
#import <UIKit/UIKit.h>
//@interface ViewController : UIViewController <UIAlertViewDelegate>
@interface ViewController : UIViewController
- (IBAction)showMessage:(id)sender;
@end
//.m
#import "ViewController.h"
@implementation ViewController
- (IBAction)showMessage:(id)sender {
UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Hello World!"
message:@"Message."
delegate:self
cancelButtonTitle:@"Cancel"
otherButtonTitles:@"Button 1", @"Button 2", nil];
[message show];
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
if([title isEqualToString:@"Button 1"])
{
NSLog(@"Button 1 was selected.");
}
}
@end
Run Code Online (Sandbox Code Playgroud) 我正在尝试使用sharedObject来协调多个游戏玩家之间舞台上几个对象的移动.我认为我非常接近,但我似乎在将存储在sharedObject中的字符串转换为Ball类的实例时遇到了问题.
我的问题在于soSync功能.我想我需要将存储在sharedObject中的'objectMoved'的值转换为对象.我可以跟踪所选对象的名称,但我无法将其作为对象检索.如何将所选对象存储在sharedObject中,然后使用它来协调与其他游戏玩家的动作?
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()">
<mx:Script>
<![CDATA[
import mx.core.UIComponent;
public var nc:NetConnection;
private var connectionURL:String = "rtmp://server address...";
public var remoteSO:SharedObject;
private var checker:Ball;
public function init():void{
//Create new checkers; place them and create listeners
for (var i:int = 0; i < 3; i++){
checker = new Ball;
checker.x = 150 + (i * 110);
checker.y = 150;
checker.name = String(i);
this.addChild(checker);
checker.addEventListener(MouseEvent.MOUSE_DOWN,handleMouseDown);
}
// Establish connection to the server
nc = new NetConnection();
//Listener triggered …Run Code Online (Sandbox Code Playgroud) I'm learning swift and have the following methods in a class:
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// Return the number of rows in the section.
return countries.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("reuseIdentifier", forIndexPath: indexPath) as UITableViewCell
cell.textLabel!.text = countries[indexPath.row]
return cell
}
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This is puzzling to me as I have not programmed before where I can have a method (i.e. tableView) that can be called …
我有一个用户数据库,其中包含一个使用md5加密的电子邮件地址.我想向其中一个用户发送电子邮件,并想知道这是否可行.换句话说,我可以使用加密字段发送电子邮件吗?
我想动态生成按钮.下面的代码生成2个按钮.但是我怎样才能编写一个循环来生成批量(100或1000)按钮.
- (void)viewDidLoad
{
//allocate the view
self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
//set the view's background color
self.view.backgroundColor = [UIColor whiteColor];
//create the buttons
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
//set the position of the button
button.frame = CGRectMake(100, 170, 100, 30);
button1.frame = CGRectMake(200, 170, 100, 30);
//set the button's title
[button setTitle:@"Click Me!" forState:UIControlStateNormal];
[button1 setTitle:@"Click!" forState:UIControlStateNormal];
//listen for clicks
[button addTarget:self action:@selector(buttonPressed)
forControlEvents:UIControlEventTouchUpInside];
[button1 addTarget:self action:@selector(buttonPressed)
forControlEvents:UIControlEventTouchUpInside];
//add the button to …Run Code Online (Sandbox Code Playgroud) ios ×3
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