隐藏字符串的个别字段

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

NSString *newStr =@"徐汇区926号103室";
NSString *temp = nil;
NSMutableString *mutableString = [[NSMutableString alloc]init];
NSMutableArray *array = [NSMutableArray array];
for(int i =0; i < [newStr length]; i++)
{
temp = [newStr substringWithRange:NSMakeRange(i, 1)];
if (![self isPureInt:temp]) {
NSString *mutableString2 =  [mutableString stringByAppendingString:temp];
[array addObject:mutableString2];
}else{
NSString *starStr =  [temp stringByReplacingOccurrencesOfString:temp withString:@"*"];
[array addObject:starStr];

}
}
NSString *string = [array componentsJoinedByString:@""];
NSLog(@"%@", string);

return YES;
}

- (BOOL)isPureInt:(NSString*)string{
NSScanner* scan = [NSScanner scannerWithString:string];
int val;
return [scan scanInt:&val] && [scan isAtEnd];
}