ios NSMakeRange(i, 1) 是什么意思？
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What does NSMakeRange(i, 1) mean?
提问by Xiaodong Gong
I just start to learn iOS.
What does "NSMakeRange(i, 1)" mean?
我刚开始学习iOS。
“ NSMakeRange(i, 1)”是什么意思？
for (int i = 0; i < [name length]; i++)
{
NSRange range = NSMakeRange(i, 1);
NSString *subString = [name substringWithRange:range];
const char *cString = [subString UTF8String];
if (strlen(cString) != 3)
{
return NO;
}
}
Where is it used?
它在哪里使用？
回答by bdash
NSMakeRange(i, 1)creates a range with location iand length 1. See the documentation for NSMakeRangeand NSString substringWithRangefor further information and related functions.
NSMakeRange(i, 1)创建一个包含 locationi和 length的范围1。有关更多信息和相关功能，请参阅NSMakeRange和NSString substringWithRange的文档。
回答by zoul
Alt-click the function name in Xcode, you'll get a reference. The function creates a range that starts at iand has length of 1. In essence, you're picking individual characters from the string.
Alt- 在 Xcode 中单击函数名称，您将获得一个引用。该函数创建一个从 1 开始i且长度为 1的范围。本质上，您是从字符串中挑选单个字符。
