xcode 如何识别和删除换行符和空格？
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How to identify and remove newline and white spaces?
提问by amar
I am making an nsmutable array by separating a string by component it is causing a lot of new line and white spaces to be inserted in the array how to identify and remove them?
我正在通过按组件分隔字符串来制作一个 nsmutable 数组，它会导致在数组中插入大量新行和空格，如何识别和删除它们？
for (int i=0;i<contentsOfFile.count; i++)
{
if(!([[contentsOfFile objectAtIndex:i]isEqual:@"\n"]||[[contentsOfFile objectAtIndex:i]isEqual:@""]))
[arrayToBereturned addObject:[contentsOfFile objectAtIndex:i]];
}
this code which i am using cannot identify all new line charectors thanks
我正在使用的此代码无法识别所有新行字符，谢谢
回答by Naina Soni
To remove all extra space and \n from your string-
要从字符串中删除所有额外的空格和 \n-
NSString* result = [yourString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
than prepare your contentsOfFile Array.
比准备你的 contentsOfFile 数组。
回答by Espresso
If you want an array without whitespace:
如果你想要一个没有空格的数组：
NSString *string = @"Hello, World!";
NSCharacterSet *separator = [NSCharacterSet whitespaceAndNewlineCharacterSet];
NSArray *stringComponents = [string componentsSeparatedByCharactersInSet:separator];
回答by Yunus Nedim Mehel
stringByTrimmingCharachersInSet:only removes desired characters from the end and the beginning of the string. To remove all occurences you should use stringByReplacingOccurrencesOfString:
stringByTrimmingCharachersInSet:只从字符串的末尾和开头删除所需的字符。要删除您应该使用的所有事件stringByReplacingOccurrencesOfString:
回答by Pavel Stepanov
Swift 5 version
斯威夫特 5 版本
let string = "Hello, stack overflow!"
let components = string.components(separatedBy: .whitespacesAndNewlines)
print(components) // prints ["Hello,", "stack", "overflow!"]
Also regarding string.replacingOccurrences
还有关于 string.replacingOccurrences
let string = " Hello, stack overflow ! "
let noSpacingsString = string.replacingOccurrences(of: " ", with: "")
print(components) // prints "Hello,stackoverflow!"
