iOS--判断字符串NSString中数字、中文、大小写英文

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 NSString *testString = @"中文123ljfLJF";    NSInteger alength = [testString length];    for (int i = 0; i<alength; i++) {        char commitChar = [testString characterAtIndex:i];        NSString *temp = [testString substringWithRange:NSMakeRange(i,1)];        const char *u8Temp = [temp UTF8String];        if (3==strlen(u8Temp)){            NSLog(@"字符串中含有中文");        }else if((commitChar>64)&&(commitChar<91)){            NSLog(@"字符串中含有大写英文字母");        }else if((commitChar>96)&&(commitChar<123)){            NSLog(@"字符串中含有小写英文字母");        }else if((commitChar>47)&&(commitChar<58)){            NSLog(@"字符串中含有数字");        }else{            NSLog(@"字符串中含有非法字符");        }    }

//判断是否为整形：- (BOOL)isPureInt:(NSString*)string{    NSScanner* scan = [NSScanner scannerWithString:string];    int val;    return[scan scanInt:&val] && [scan isAtEnd];}//判断是否为浮点形：- (BOOL)isPureFloat:(NSString*)string{    NSScanner* scan = [NSScanner scannerWithString:string];    float val;    return[scan scanFloat:&val] && [scan isAtEnd];}if( ![self isPureInt:textField.text] || ![self isPureFloat:textField.text]){                textField.textColor = [UIColor redColor];                textField.text = @"警告:含非法字符，请输入纯数字！";                return;            }else{                NSLog(@"整形或浮点型");            }

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