小编War*_*ton的帖子

我想确定一个字符串的书写方向,这样我就可以在CALayer中正确地呈现从右到左的语言,例如阿拉伯语.

所以我有这个方法

+(UITextAlignment)alignmentForString:(NSString *)astring
{
    UITextView *text = [[UITextView alloc] initWithFrame:CGRectZero];
    text.text = astring;

    if ([text baseWritingDirectionForPosition:[text beginningOfDocument] inDirection:UITextStorageDirectionForward] == UITextWritingDirectionRightToLeft) {
        return UITextAlignmentRight;
    }

    return UITextAlignmentLeft;

}

工作正常,但感觉有点沉重只是为了发现哪种方式来调整我的文本,特别是在drawInContext中调用它(尽管相对不频繁).

是否有一种较轻的方法来确定给定字符串的书写方向,或者我应该在过早优化的基础上坚持这一点.它必须是iOS 5友好的.

以下是我的枚举

enum HomeDataType: String, CaseIterable {
  case questions           = "questions"
  case smallIcons          = "smallIcons"
  case retailers           = "retailers"
  case products            = "products"
  case banners             = "banners"
  case single_product      = "single_product"
  case single_retail       = "single_retail"
  case categories          = "categories"
  case airport             = "All_Airport"
  case single_banner       = "single_banner"
  case none                = "none"
}

想要检查枚举中是否存在某个值？怎么做？

首先,我有一个 Could not build module Foundation

试图通过设置Enable Modules (C and Objective-C)来解决这个问题NO

在另一个构建后,我得到了这些奇怪的错

Undefined symbols for architecture i386:
  "_OBJC_CLASS_$_EAGLContext", referenced from:
      objc-class-ref in EZAudioPlotGLKViewController-11ED1EEF7D7801BD.o
  "_OBJC_CLASS_$_GLKBaseEffect", referenced from:
      objc-class-ref in EZAudioPlotGLKViewController-11ED1EEF7D7801BD.o
  "_OBJC_CLASS_$_GLKViewController", referenced from:
      _OBJC_CLASS_$_EZAudioPlotGLKViewController in EZAudioPlotGLKViewController-11ED1EEF7D7801BD.o
  "_OBJC_CLASS_$_NSEntityDescription", referenced from:
      objc-class-ref in JSONModel+CoreData.o
  "_OBJC_CLASS_$_NSManagedObject", referenced from:
      l_OBJC_$_CATEGORY_NSManagedObject_$_JSONModel in JSONModel+CoreData.o
      objc-class-ref in JSONModel+CoreData.o
  "_OBJC_METACLASS_$_GLKViewController", referenced from:
      _OBJC_METACLASS_$_EZAudioPlotGLKViewController in EZAudioPlotGLKViewController-11ED1EEF7D7801BD.o
  "_SSLClose", referenced from:
      -[GCDAsyncSocket closeWithError:] in GCDAsyncSocket.o
  "_SSLCopyPeerTrust", referenced from:
      -[GCDAsyncSocket ssl_continueSSLHandshake] in GCDAsyncSocket.o
  "_SSLCreateContext", referenced from:
      -[GCDAsyncSocket ssl_startTLS] in GCDAsyncSocket.o …

我有三个数组,priceArray,nameArray和discountArray.我在tableView中显示这些数组值.每个单元格都有价格,名称,折扣.

我想通过Price Low to High对列表进行排序,反之亦然,nameArray和discountArray中的项目需要根据价格排序进行排序.

同样,我希望按名称从AZ排序,反之亦然,并相应地对价格和折扣进行排序.

1 cell -- 20,xxx,10%
2 cell -- 10,zzz,10%
3 cell -- 150,aaa,0%
4 cell -- 100,hhh,15%

By Price Low to High
   10,zzz,10%
   20,xxx,10%
   100,hhh,15%
   150,aaa,0%

By Name A-Z
   150,aaa,0%
   100,hhh,15%
   20,xxx,10%
   10,zzz,10%

帮我这样排序.