如何检查字符串是否包含空格 [英] How to check whether a string contains white spaces

问题描述

如何检查字符串是否在字符之间包含空格？

How to check whether a string contains whitespaces in between characters?

推荐答案

使用rangeOfCharactersFromSet ：

NSString *foo = @"HALLO WELT";
NSRange whiteSpaceRange = [foo rangeOfCharacterFromSet:[NSCharacterSet whitespaceCharacterSet]];
if (whiteSpaceRange.location != NSNotFound) {
    NSLog(@"Found whitespace");
}

注意：这也会在字符串的开头或结尾找到空格。如果你不想首先修剪字符串......

note: this will also find whitespace at the beginning or end of the string. If you don't want this trim the string first...

NSString *trimmedString = [foo stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSRange whiteSpaceRange = [trimmedString rangeOfCharacterFromSet:[NSCharacterSet whitespaceCharacterSet]];

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