Using custom NSNumberFormatter to prevent errors on validation.

MacPass/MPNumberFormatter.m

@@ -0,0 +1,33 @@
+//
+//  MPNumberFormatter.m
+//  MacPass
+//
+//  Created by Michael Starke on 24/08/16.
+//  Copyright © 2016 HicknHack Software GmbH. All rights reserved.
+//
+
+#import "MPNumberFormatter.h"
+
+@implementation MPNumberFormatter
+
+- (instancetype)initWithCoder:(NSCoder *)aDecoder {
+  self = [super initWithCoder:aDecoder];
+  self.minimum = [NSDecimalNumber one];
+  self.formatterBehavior = NSNumberFormatterBehavior10_4;
+  self.allowsFloats = NO;
+  self.alwaysShowsDecimalSeparator = NO;
+  return self;
+}
+
+- (BOOL)getObjectValue:(out id __nullable * __nullable)obj forString:(NSString *)string errorDescription:(out NSString * __nullable * __nullable)error {
+  /* If super can pase without an error, all is fine */
+  if([super getObjectValue:obj forString:string errorDescription:error]) {
+    return YES;
+  }
+  /* TODO adhere to minimum/maxiumum? */
+  *obj = [self.minimum copy];
+  return YES;
+}
+
+
+@end