- html - 出于某种原因,IE8 对我的 Sass 文件中继承的 html5 CSS 不友好?
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景?
抱歉我的描述不清楚,我的目的是显示一些不常见的边框,比如虚线、点、渐变等,但是使用贝塞尔曲线来绘制无法与layer.cornerRadius
。当然,可以使用layer.mask
。为了解决这个问题,出于性能考虑和我的好奇心,我想将它们完美地结合起来。
我想自己为 UIView
绘制一个自定义边框。在这个过程中,我遇到了一些让我困惑的问题:
我已经解决了第一个问题,因为绘制曲线的 Nib 处于线宽的中间,所以无法沿着 View 的边缘进行绘制。需要一定的距离。
为了解决这个问题,我将线段从 View 中分离出来,以便更好地观察:
let bgView = UIView(frame: CGRect(x: 0, y: 0, width: 80, height: 80))
bgView.backgroundColor = UIColor.red
bgView.layer.cornerRadius = 10
view.addSubview(bgView)
let imageView = UIImageView()
imageView.frame = CGRect(x: 100, y: 100, width: 100, height: 100)
imageView.backgroundColor = UIColor.clear
view.addSubview(imageView)
bgView.center = imageView.center
//draw a 80 * 80 image in the context center
UIGraphicsBeginImageContextWithOptions(CGSize(width: 100, height: 100), false, UIScreen.main.scale)
let borderWidth = 4
let rect = CGRect(x: 10 , y: 10, width: 80, height: 80)
let roundPath = UIBezierPath(roundedRect: rect, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: 10, height: 10))
roundPath.lineWidth = 4
roundPath.lineJoinStyle = .round
UIColor.black.withAlphaComponent(0.3).setStroke()
roundPath.stroke()
imageView.image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
运行并放大,你会看到:
可以看到 View 的边缘在线宽的中间,所以解决办法是调整贝塞尔曲线矩形的绘制。
//change
//let rect = CGRect(x: 10 , y: 10, width: 80, height: 80)
//to
let rect = CGRect(x: 10 + 2, y: 10 + 2, width: 80 - 4, height: 80 - 4)
但是我没有找到相关文档来解释它。有谁知道吗?
由于Q1的解,也找到了Q2:
只有View的圆角超出了贝塞尔曲线的范围。
一开始我以为是贝塞尔曲线的绘制方式有问题,所以分解了绘制步骤:
let roundPath3 = UIBezierPath()
roundPath3.lineWidth = 4
roundPath3.lineJoinStyle = .round
roundPath3.move(to: CGPoint(x: rect.minX + 10, y: rect.minY))
roundPath3.addLine(to: CGPoint(x: rect.maxX - 10, y: rect.minY))
roundPath3.addArc(withCenter: CGPoint(x: rect.maxX - 10, y: rect.minY + 10), radius: 10, startAngle: 1.5 * CGFloat.pi, endAngle: 2 * CGFloat.pi, clockwise: true)
roundPath3.move(to: CGPoint(x: rect.maxX, y: rect.minY + 10))
roundPath3.addLine(to: CGPoint(x: rect.maxX, y: rect.maxY - 10))
roundPath3.addArc(withCenter: CGPoint(x: rect.maxX - 10, y: rect.maxY - 10), radius: 10, startAngle: 0 * CGFloat.pi, endAngle: 0.5 * CGFloat.pi, clockwise: true)
roundPath3.move(to: CGPoint(x: rect.maxX - 10, y: rect.maxY))
roundPath3.addLine(to: CGPoint(x: rect.minX + 10, y: rect.maxY))
roundPath3.addArc(withCenter: CGPoint(x: rect.minX + 10, y: rect.maxY - 10), radius: 10, startAngle: 0.5 * CGFloat.pi, endAngle: 1 * CGFloat.pi, clockwise: true)
roundPath3.move(to: CGPoint(x: rect.minX, y: rect.maxY - 10))
roundPath3.addLine(to: CGPoint(x: rect.minX, y: rect.minY + 10))
roundPath3.addArc(withCenter: CGPoint(x: rect.minX + 10, y: rect.minY + 10), radius: 10, startAngle: 1 * CGFloat.pi, endAngle: 1.5 * CGFloat.pi, clockwise: true)
UIColor.blue.withAlphaComponent(0.5).setStroke()
roundPath3.stroke()
不幸的是,它与上面的结果相同。我还尝试将绘制的圆弧半径延长 1pt。虽然它覆盖了 View 的圆角,但结果很丑。
我仔细观察,猜想iOS系统的实现看起来并不像一个纯粹的圆形,更像是一个椭圆形。所以我有一个想法,调整二次贝塞尔曲线的控制点来模拟,但我没有线索来计算合适的控制点。
最佳答案
您在这里遇到了几个问题...
首先,.cornerRadius
有两种曲线类型:
.round
——默认值。非常适合制作“圆形” View .continuous
-- 更令人愉悦的视觉曲线,最适合“圆角”为了演示差异,这里有一个位于红色 View 之上的绿色 View ,其中红色 View 使用 .round
,绿色 View 使用 .continuous
:
请注意,如果我们将两者都设置为 .continuous
,我们会得到:
UIBezierPath(roundedRect: ...)
使用 .continuous
曲线,因此如果我们屏蔽绿色 View (而不是设置其 .cornerRadius
) 并使用红色 View 的默认曲线,它看起来与第一个示例相同:
如果我们屏蔽绿色 View 并将红色 View 设置为 .continuous
,我们会得到与第二个示例相同的结果:
如果你仔细观察,你会看到一个微弱的红色“边缘”——这是由于 UIKit
抗锯齿功能造成的。如果我们将“绿色 View ”背景色设置为白色,则非常明显:
但是,这是一个不同的问题,可能不会影响您想要做的事情。
下一部分是尝试“勾勒” View 。如您所知,路径的笔划
被设置为曲线的中心线:
我们有一半的笔画宽度在里面,一半的笔画宽度在外面。
因此,“修复”的尝试是将轮廓 View 插入笔划宽度的 1/2...但是,再次如您所见,我们最终会得到以下结果:
那是因为笔划最终以 3 个不同的半径结束!
让我们使用 40
的圆角半径和 16
的描边宽度,以使其更易于查看。
这是具有相同大小的 View :
如果我们只是将“轮廓 View ”插入边框宽度的 1/2 并且不更改半径,我们会得到:
那么,让我们将贝塞尔曲线路径的角半径调整为笔划宽度的 1/2:
我们的最终结果(没有中心线形状层)是:
这里有一些代码可供使用并检查正在发生的情况 - 每次点击都会执行我上面描述的步骤:
class CornersViewController: UIViewController {
let stepLabel = UILabel()
let infoLabel = UILabel()
let bgViewWidth: CGFloat = 400
let cornerRadius: CGFloat = 40
let borderWidth: CGFloat = 16
lazy var viewFrame: CGRect = CGRect(x: -200, y: 260, width: bgViewWidth, height: bgViewWidth)
var step: Int = 1
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
stepLabel.translatesAutoresizingMaskIntoConstraints = false
stepLabel.font = .systemFont(ofSize: 12.0, weight: .bold)
//stepLabel.textAlignment = .center
view.addSubview(stepLabel)
infoLabel.translatesAutoresizingMaskIntoConstraints = false
infoLabel.numberOfLines = 0
infoLabel.font = .systemFont(ofSize: 12.0, weight: .light)
view.addSubview(infoLabel)
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
stepLabel.topAnchor.constraint(equalTo: g.topAnchor, constant: 20.0),
stepLabel.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 20.0),
stepLabel.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -20.0),
infoLabel.topAnchor.constraint(equalTo: stepLabel.bottomAnchor, constant: 8.0),
infoLabel.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 20.0),
infoLabel.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -20.0),
])
let t = UITapGestureRecognizer(target: self, action: #selector(gotTap(_:)))
view.addGestureRecognizer(t)
nextStep()
}
@objc func gotTap(_ g: UITapGestureRecognizer) -> Void {
nextStep()
}
func nextStep() {
// remove existing example views, but not the "info" label
view.subviews.forEach { v in
if !(v is UILabel) {
v.removeFromSuperview()
}
}
stepLabel.text = "Step: \(step) of \(infoStrings.count)"
infoLabel.text = infoStrings[step - 1]
// red: .cornerCurve = .round (default)
// green: .cornerCurve = .continuous
if step == 1 {
let redView = UIView(frame: viewFrame)
view.addSubview(redView)
redView.backgroundColor = UIColor.red
redView.layer.cornerRadius = cornerRadius
let greenView = UIView(frame: viewFrame)
view.addSubview(greenView)
greenView.backgroundColor = UIColor.green
greenView.layer.cornerRadius = cornerRadius
greenView.layer.cornerCurve = .continuous
}
// red: .cornerCurve = .continuous
// green: .cornerCurve = .continuous
if step == 2 {
let redView = UIView(frame: viewFrame)
view.addSubview(redView)
redView.backgroundColor = UIColor.red
redView.layer.cornerRadius = cornerRadius
redView.layer.cornerCurve = .continuous
let greenView = UIView(frame: viewFrame)
view.addSubview(greenView)
greenView.backgroundColor = UIColor.green
greenView.layer.cornerRadius = cornerRadius
greenView.layer.cornerCurve = .continuous
}
// red: .cornerCurve = .round (default)
// green: masked with UIBezierPath(roundedRect: ...)
if step == 3 {
let redView = UIView(frame: viewFrame)
view.addSubview(redView)
redView.backgroundColor = UIColor.red
redView.layer.cornerRadius = cornerRadius
let greenView = UIView(frame: viewFrame)
view.addSubview(greenView)
greenView.backgroundColor = UIColor.green
let maskLayer = CAShapeLayer()
let maskBez = UIBezierPath(roundedRect: greenView.bounds, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
maskLayer.path = maskBez.cgPath
greenView.layer.mask = maskLayer
}
// red: .cornerCurve = .continuous
// green: masked with UIBezierPath(roundedRect: ...)
if step == 4 {
let redView = UIView(frame: viewFrame)
view.addSubview(redView)
redView.backgroundColor = UIColor.red
redView.layer.cornerRadius = cornerRadius
redView.layer.cornerCurve = .continuous
let greenView = UIView(frame: viewFrame)
view.addSubview(greenView)
greenView.backgroundColor = UIColor.green
let maskLayer = CAShapeLayer()
let maskBez = UIBezierPath(roundedRect: greenView.bounds, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
maskLayer.path = maskBez.cgPath
greenView.layer.mask = maskLayer
}
// red: .cornerCurve = .continuous
// bordered: sublayer with UIBezierPath(roundedRect: ...)
// clear fill, 30%-black stroke, lineWidth == borderWidth
if step == 5 {
let redView = UIView(frame: viewFrame)
view.addSubview(redView)
redView.backgroundColor = UIColor.red
redView.layer.cornerRadius = cornerRadius
redView.layer.cornerCurve = .continuous
let borderedView = UIView(frame: viewFrame)
view.addSubview(borderedView)
borderedView.backgroundColor = UIColor.clear
borderedView.layer.cornerRadius = cornerRadius
borderedView.layer.cornerCurve = .continuous
let borderLayer = CAShapeLayer()
let roundPath = UIBezierPath(roundedRect: borderedView.bounds, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
borderLayer.path = roundPath.cgPath
borderLayer.lineWidth = borderWidth
borderLayer.fillColor = UIColor.clear.cgColor
borderLayer.strokeColor = UIColor.black.withAlphaComponent(0.3).cgColor
borderedView.layer.addSublayer(borderLayer)
}
// red: .cornerCurve = .continuous
// bordered: sublayer with UIBezierPath(roundedRect: ...)
// clear fill, 30%-black stroke, lineWidth == borderWidth
// frame inset by 1/2 borderWidth
if step == 6 {
let redView = UIView(frame: viewFrame)
view.addSubview(redView)
redView.backgroundColor = UIColor.red
redView.layer.cornerRadius = cornerRadius
redView.layer.cornerCurve = .continuous
let borderedView = UIView(frame: viewFrame)
view.addSubview(borderedView)
borderedView.backgroundColor = UIColor.red
borderedView.layer.cornerRadius = cornerRadius
borderedView.layer.cornerCurve = .continuous
let borderLayer = CAShapeLayer()
let rect = borderedView.bounds.insetBy(dx: borderWidth * 0.5, dy: borderWidth * 0.5)
let roundPath = UIBezierPath(roundedRect: rect, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
borderLayer.path = roundPath.cgPath
borderLayer.lineWidth = borderWidth
borderLayer.fillColor = UIColor.clear.cgColor
borderLayer.strokeColor = UIColor.black.withAlphaComponent(0.3).cgColor
borderedView.layer.addSublayer(borderLayer)
}
// red: .cornerCurve = .continuous
// bordered: sublayer with UIBezierPath(roundedRect: ...)
// clear fill, 30%-black stroke, lineWidth == borderWidth
// frame inset by 1/2 borderWidth
// showing border centerLine
if step == 7 {
let redView = UIView(frame: viewFrame)
view.addSubview(redView)
redView.backgroundColor = UIColor.red
redView.layer.cornerRadius = cornerRadius
redView.layer.cornerCurve = .continuous
let borderedView = UIView(frame: viewFrame)
view.addSubview(borderedView)
borderedView.backgroundColor = UIColor.red
borderedView.layer.cornerRadius = cornerRadius
borderedView.layer.cornerCurve = .continuous
let borderLayer = CAShapeLayer()
let rect = borderedView.bounds.insetBy(dx: borderWidth * 0.5, dy: borderWidth * 0.5)
let roundPath = UIBezierPath(roundedRect: rect, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
borderLayer.path = roundPath.cgPath
borderLayer.lineWidth = borderWidth
borderLayer.fillColor = UIColor.clear.cgColor
borderLayer.strokeColor = UIColor.black.withAlphaComponent(0.3).cgColor
borderedView.layer.addSublayer(borderLayer)
let centerLineLayer = CAShapeLayer()
centerLineLayer.path = roundPath.cgPath
centerLineLayer.lineWidth = 1
centerLineLayer.fillColor = UIColor.clear.cgColor
centerLineLayer.strokeColor = UIColor.cyan.cgColor
borderedView.layer.addSublayer(centerLineLayer)
}
// red: .cornerCurve = .continuous
// bordered: sublayer with UIBezierPath(roundedRect: ...)
// clear fill, 30%-black stroke, lineWidth == borderWidth
// frame inset by 1/2 borderWidth
// radius adjusted by 1/2 borderWidth
// showing border centerLine
if step == 8 {
let redView = UIView(frame: viewFrame)
view.addSubview(redView)
redView.backgroundColor = UIColor.red
redView.layer.cornerRadius = cornerRadius
redView.layer.cornerCurve = .continuous
let borderedView = UIView(frame: viewFrame)
view.addSubview(borderedView)
borderedView.backgroundColor = UIColor.red
borderedView.layer.cornerRadius = cornerRadius
borderedView.layer.cornerCurve = .continuous
let borderLayer = CAShapeLayer()
let rect = borderedView.bounds.insetBy(dx: borderWidth * 0.5, dy: borderWidth * 0.5)
let adjustedRadius = cornerRadius - (borderWidth * 0.5)
let roundPath = UIBezierPath(roundedRect: rect, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: adjustedRadius, height: adjustedRadius))
borderLayer.path = roundPath.cgPath
borderLayer.lineWidth = borderWidth
borderLayer.fillColor = UIColor.clear.cgColor
borderLayer.strokeColor = UIColor.black.withAlphaComponent(0.3).cgColor
borderedView.layer.addSublayer(borderLayer)
let centerLineLayer = CAShapeLayer()
centerLineLayer.path = roundPath.cgPath
centerLineLayer.lineWidth = 1
centerLineLayer.fillColor = UIColor.clear.cgColor
centerLineLayer.strokeColor = UIColor.cyan.cgColor
borderedView.layer.addSublayer(centerLineLayer)
}
// red: .cornerCurve = .continuous
// bordered: sublayer with UIBezierPath(roundedRect: ...)
// clear fill, 30%-black stroke, lineWidth == borderWidth
// frame inset by 1/2 borderWidth
// radius adjusted by 1/2 borderWidth
if step == 9 {
let redView = UIView(frame: viewFrame)
view.addSubview(redView)
redView.backgroundColor = UIColor.red
redView.layer.cornerRadius = cornerRadius
redView.layer.cornerCurve = .continuous
let borderedView = UIView(frame: viewFrame)
view.addSubview(borderedView)
borderedView.backgroundColor = UIColor.red
borderedView.layer.cornerRadius = cornerRadius
borderedView.layer.cornerCurve = .continuous
let borderLayer = CAShapeLayer()
let rect = borderedView.bounds.insetBy(dx: borderWidth * 0.5, dy: borderWidth * 0.5)
let adjustedRadius = cornerRadius - (borderWidth * 0.5)
let roundPath = UIBezierPath(roundedRect: rect, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: adjustedRadius, height: adjustedRadius))
borderLayer.path = roundPath.cgPath
borderLayer.lineWidth = borderWidth
borderLayer.fillColor = UIColor.clear.cgColor
borderLayer.strokeColor = UIColor.black.withAlphaComponent(0.3).cgColor
borderedView.layer.addSublayer(borderLayer)
}
// red: .cornerCurve = .continuous
// white: .cornerCurve = .continuous
if step == 10 {
let redView = UIView(frame: viewFrame)
view.addSubview(redView)
redView.backgroundColor = UIColor.red
redView.layer.cornerRadius = cornerRadius
redView.layer.cornerCurve = .continuous
let whiteView = UIView(frame: viewFrame)
view.addSubview(whiteView)
whiteView.backgroundColor = UIColor.white
whiteView.layer.cornerRadius = cornerRadius
whiteView.layer.cornerCurve = .continuous
}
step += 1
if step > infoStrings.count {
step = 1
}
}
let infoStrings: [String] = [
"redView:\n .cornerCurve = .round (default)\n\ngreenView:\n .cornerCurve = .continuous",
"redView:\n .cornerCurve = .continuous\n\ngreenView:\n .cornerCurve = .continuous",
"redView:\n .cornerCurve = .round (default)\n\ngreenView:\n masked with UIBezierPath(roundedRect: ...)",
"redView:\n .cornerCurve = .continuous\n\ngreenView:\n masked with UIBezierPath(roundedRect: ...)",
"redView:\n .cornerCurve = .continuous\n\nborderedView:\n sublayer with UIBezierPath(roundedRect: ...)\n clear fill, 30%-black stroke, lineWidth == borderWidth",
"redView:\n .cornerCurve = .continuous\n\nborderedView:\n sublayer with UIBezierPath(roundedRect: ...)\n clear fill, 30%-black stroke, lineWidth == borderWidth\n frame inset by 1/2 borderWidth",
"redView:\n .cornerCurve = .continuous\n\nborderedView:\n sublayer with UIBezierPath(roundedRect: ...)\n clear fill, 30%-black stroke, lineWidth == borderWidth\n frame inset by 1/2 borderWidth\n showing border center line",
"redView:\n .cornerCurve = .continuous\n\nborderedView:\n sublayer with UIBezierPath(roundedRect: ...)\n clear fill, 30%-black stroke, lineWidth == borderWidth\n frame inset by 1/2 borderWidth\n radius adjusted by 1/2 borderWidth\n showing border center line",
"redView:\n .cornerCurve = .continuous\n\nborderedView:\n sublayer with UIBezierPath(roundedRect: ...)\n clear fill, 30%-black stroke, lineWidth == borderWidth\n frame inset by 1/2 borderWidth\n radius adjusted by 1/2 borderWidth\n final result",
"redView:\n .cornerCurve = .continuous\n\nwhiteView:\n .cornerCurve = .continuous\n\n Showing the Anti-Aliasing...",
]
}
关于ios - iOS系统如何绘制 View 角形状?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/66829955/
IO 设备如何知道属于它的内存中的值在memory mapped IO 中发生了变化? ? 例如,假设内存地址 0 专用于保存 VGA 设备的背景颜色。当我们更改 memory[0] 中的值时,VGA
我目前正在开发一个使用Facebook sdk登录(通过FBLoginView)的iOS应用。 一切正常,除了那些拥有较旧版本的facebook的人。 当他们按下“使用Facebook登录”按钮时,他
假设我有: this - is an - example - with some - dashesNSRange将使用`rangeOfString:@“-”拾取“-”的第一个实例,但是如果我只想要最后
Card.io SDK提供以下详细信息: 卡号,有效期,月份,年份,CVV和邮政编码。 如何从此SDK获取国家名称。 - (void)userDidProvideCreditCardInfo:(Car
iOS 应用程序如何从网络服务下载图片并在安装过程中将它们安装到用户的 iOS 设备上?可能吗? 最佳答案 您无法控制应用在用户设备上的安装,因此无法在安装过程中下载其他数据。 只需在安装后首次启动应
我曾经开发过一款企业版 iOS 产品,我们公司曾将其出售给大型企业,供他们的员工使用。 该应用程序通过 AppStore 提供,企业用户获得了公司特定的配置文件(包含应用程序配置文件)以启用他们有权使
我正在尝试将 Card.io SDK 集成到我的 iOS 应用程序中。我想为 CardIO ui 做一个简单的本地化,如更改取消按钮标题或“在此保留信用卡”提示文本。 我在 github 上找到了这个
我正在使用 CardIOView 和 CardIOViewDelegate 类,没有可以设置为 YES 的 BOOL 来扫描 collectCardholderName。我可以看到它在 CardIOP
我有一个集成了通话工具包的 voip 应用程序。每次我从我的 voip 应用程序调用时,都会在 native 电话应用程序中创建一个新的最近通话记录。我在 voip 应用程序中也有自定义联系人(电话应
iOS 应用程序如何知道应用程序打开时屏幕上是否已经有键盘?应用程序运行后,它可以接收键盘显示/隐藏通知。但是,如果应用程序在分屏模式下作为辅助应用程序打开,而主应用程序已经显示键盘,则辅助应用程序不
我在模拟器中收到以下错误: ImageIO: CGImageReadSessionGetCachedImageBlockData *** CGImageReadSessionGetCachedIm
如 Apple 文档所示,可以通过 EAAccessory Framework 与经过认证的配件(由 Apple 认证)进行通信。但是我有点困惑,因为一些帖子告诉我它也可以通过 CoreBluetoo
尽管现在的调试器已经很不错了,但有时找出应用程序中正在发生的事情的最好方法仍然是古老的 NSLog。当您连接到计算机时,这样做很容易; Xcode 会帮助弹出日志查看器面板,然后就可以了。当您不在办公
在我的 iOS 应用程序中,我定义了一些兴趣点。其中一些有一个 Kontakt.io 信标的名称,它绑定(bind)到一个特定的 PoI(我的意思是通常贴在信标标签上的名称)。现在我想在附近发现信标,
我正在为警报提示创建一个 trigger.io 插件。尝试从警报提示返回数据。这是我的代码: // Prompt + (void)show_prompt:(ForgeTask*)task{
您好,我是 Apple iOS 的新手。我阅读并搜索了很多关于推送通知的文章,但我没有发现任何关于 APNS 从 io4 到 ios 6 的新更新的信息。任何人都可以向我提供 APNS 如何在 ios
UITabBar 的高度似乎在 iOS 7 和 8/9/10/11 之间发生了变化。我发布这个问题是为了让其他人轻松找到答案。 那么:在 iPhone 和 iPad 上的 iOS 8/9/10/11
我想我可以针对不同的 iOS 版本使用不同的 Storyboard。 由于 UI 的差异,我将创建下一个 Storyboard: Main_iPhone.storyboard Main_iPad.st
我正在写一些东西,我将使用设备的 iTunes 库中的一部分音轨来覆盖 2 个视频的组合,例如: AVMutableComposition* mixComposition = [[AVMutableC
我创建了一个简单的 iOS 程序,可以顺利编译并在 iPad 模拟器上运行良好。当我告诉 XCode 4 使用我连接的 iPad 设备时,无法编译相同的程序。问题似乎是当我尝试使用附加的 iPad 时
我是一名优秀的程序员,十分优秀!