From the Swift blog:
This feature was first released in Xcode 6.3 with the keywords __nullable and __nonnull. Due to potential conflicts with third-party libraries, we’ve changed them in Xcode 7 to the _Nullable and _Nonnull you see here. However, for compatibility with Xcode 6.3 we’ve predefined m...
本文主要关于在 Ubuntu 中安装和使用 Swift 的相关步骤。
(以 Ubuntu 15.10 为例)
下载 Swift
在 Swift.org 找到并下载对应的 Swift 版本。
解压 Swift
$ cd Swift压缩包所在目录的路径
$ tar -xf Swift压缩包文件名.tar.gz
$ mv Swift解压后的文件夹名 /swift
(最后一句 mv 是为了方便操作，可以省略，/swift 也可以是其它路径)
举个例子:
$ cd /home/meniny/Desktop/swift-2.2.1-RELEASE-ubuntu15.10.tar.gz
$ tar -x...
Some times using percentages for fluidity in layouts is tricky because you have to deal with containers and border-type things.
Look in to using viewport units and learn some thing about it on css-tricks and caniuse will show you how well it's supported.
Essentially you can say:
<div style="...
The way to change the cursor when it's over an NSButton:
First, you should subclass NSButton first, then add the code below:
@property (strong) NSCursor *cursor;
- (void)resetCursorRects {
if (self.cursor) {
[self addCursorRect:[self bounds] cursor: self.cursor];
} else {
...
