一.问题描述 下载图片,然后用Quartz2D绘制缩放的图片,运行无法显示图片并且编译器警告: Aug 18 21:41:50 02_计算UITableViewCell的行高[16777] <Error>: CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.Aug 18 2…
最近在用Xcode 6.3写代码,一些涉及到对象的代码会报如下编译器警告: 1 Pointer is missing a nullability type specifier (__nonnull or __nullable) 于是google了一下,发现这是Xcode 6.3的一个新特性,即nullability annotations. Nullability Annotations 我们都知道在swift中,可以使用!和?来表示一个对象是optional的还是non-optional,如v…
Compiler Warnings 编译器警告 Oracle 10g allows you to enable compile-time warnings that are useful to identify potential run-time problems in your programs. These warnings are not serious enough to raise an exception at compile time, but may cause run-tim…
@SuppressWarnings(“XXXX”) 来抑制编译时的警告信息.参数如下: 关键字 用途 all to suppress all warnings boxing to suppress warnings relative to boxing/unboxing operations cast to suppress warnings relative to cast operations dep-ann to suppress warnings relative to depreca…