iphone - 如何检查字符串是否包含空格

Question

如何检查字符串中字符之间是否包含空格？

Answer 1

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。如果您不想先修剪字符串...

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