支持以前iOS版本和弃用方法功能的最佳方式 [英] Best way to support functionality for previous iOS versions and deprecated methods

问题描述

stretchableImageWithLeftCapWidth：topCapHeight：用于调整大小图像的方法（iOS低于5.0），但在iOS 5中该方法已被弃用，iOS 5有新的resizableImageWithCapInsets：


支持在低于5且低于5的iOS中调整大小图像的最佳方法是什么？
我知道的第一件事就是使用responseToSelector方法。但也许有人知道其他例子。

stretchableImageWithLeftCapWidth:topCapHeight: is method that used for resize image (iOS lower than 5.0), but in iOS 5 that method is deprecated and iOS 5 have the new one resizableImageWithCapInsets:

What the best way to support resize images in iOS lower than 5 and greeter than 5? First thing that I know is to use responseToSelector method. But perhaps somebody know an other examples.

推荐答案

支持版本通常很简单，唯一要避免的陷阱是使用条件建立以决定支持哪些功能，因为这需要您为每个版本使用特定的二进制文件。

It is generally pretty simple to support versions, the only pitfall to avoid is using conditional building to decide what features to support as that would require you to use a specific binary for each version.

我会使用这样的东西：

NSString* featureVersion = @"5.0";
NSString* systemVersion = [[UIDevice currentDevice] systemVersion];
if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending)
{
     [object someIOS5SpecificMethod];
}
else
{
     [object alternateMethod];
}

要使用特定于版本的类，您可以使用类似于以下内容的类：

To use version specific classes you could always use something similar to:

Class class = NSClassFromString(@"iOS5OnlyClass");
if (class)
{
   id object = [[class alloc] init];
}

这篇关于支持以前iOS版本和弃用方法功能的最佳方式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！