//过滤空格
NSString * urlStr = @" A as dd dmm ";
NSLog(@"urlStr = %@",urlStr);
//过滤字符串前后的空格
urlStr = [urlStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSLog(@"urlStr = %@",urlStr);
//过滤中间空格
urlStr = [urlStr stringByReplacingOccurrencesOfString:@" " withString:@""];
NSLog(@"urlStr = %@",urlStr);
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