尝试使用CAGradientLayer时编译错误 [英] Compile error trying to use CAGradientLayer

问题描述

我正在尝试使用CAGradientLayer并获得无用的编译错误。无法弄清楚什么是错的。到目前为止，我所做的就是：

I'm trying to use CAGradientLayer and getting an unhelpful compile error. Can't figure out whats wrong. All I'm doing so far is:

CAGradientLayer *gradient = [CAGradientLayer layer];

我已导入< QuartzCore / QuartzCore.h> 我收到警告>

I've imported <QuartzCore/QuartzCore.h> and I'm getting the warning >

_OBJC_CLASS_ $ CAGradientLayer引自：objc-class-ref-to-CAGradientLayer symbol （s）未找到。

_OBJC_CLASS_$CAGradientLayer referenced from: objc-class-ref-to-CAGradientLayer symbol(s) not found.

我已经尝试过清洁和构建，但没有运气，我似乎无法瞄准除了4.1 in Xcode

I've tried clean and build but no luck and I can't seem to target anything other than 4.1 in Xcode

为任何帮助干杯。

推荐答案

你没有没有正确地将 QuartzCore 框架添加到您的项目中：

You didn't correctly add the QuartzCore framework into your project:

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