nsarray+addition

 
 @interface  (SafeAccess)
 -(id)objectWithIndex:(NSUInteger)index;
 
 - (NSString*)stringWithIndex:(NSUInteger)index;
 
 - (NSNumber*)numberWithIndex:(NSUInteger)index;
 
 - (NSArray*)arrayWithIndex:(NSUInteger)index;
 
 - (NSDictionary*)dictionaryWithIndex:(NSUInteger)index;
 
 - (NSInteger)integerWithIndex:(NSUInteger)index;
 
 - (BOOL)boolWithIndex:(NSUInteger)index;
 
 - (float)floatWithIndex:(NSUInteger)index;
 
 
 - (CGFloat)CGFloatWithIndex:(NSUInteger)index;
 
 - (CGPoint)pointWithIndex:(NSUInteger)index;
 
 - (CGSize)sizeWithIndex:(NSUInteger)index;
 
 - (CGRect)rectWithIndex:(NSUInteger)index;
 @end
 
 
 
 @interface NSMutableArray(SafeAccess)
 
 -(void)addObj:(id)i;
 
 -(void)addString:(NSString*)i;
 
 -(void)addInteger:(NSInteger)i;
 
 -(void)addCGFloat:(CGFloat)f;
 
 -(void)addFloat:(float)i;
 
 -(void)addPoint:(CGPoint)o;
 
 -(void)addSize:(CGSize)o;
 
 -(void)addRect:(CGRect)o;
 @end

 
 @implementation  (SafeAccess)
 -(id)objectWithIndex:(NSUInteger)index{
     if (index <self.count) {
         return self[index];
     }else{
         return nil;
     }
 }
 
 - (NSString*)stringWithIndex:(NSUInteger)index
 {
     id value = [self objectWithIndex:index];
     if (value == nil || value == [NSNull null])
     {
         return @"";
     }
     if ([value isKindOfClass:[NSString class]]) {
         return (NSString*)value;
     }
     if ([value isKindOfClass:[NSNumber class]]) {
         return [value stringValue];
     }
     
     return nil;
 }
 
 
 - (NSNumber*)numberWithIndex:(NSUInteger)index
 {
     id value = [self objectWithIndex:index];
     if ([value isKindOfClass:[NSNumber class]]) {
         return (NSNumber*)value;
     }
     if ([value isKindOfClass:[NSString class]]) {
         NSNumberFormatter * f = [[NSNumberFormatter alloc] init];
         [f setNumberStyle:NSNumberFormatterDecimalStyle];
         return [f numberFromString:(NSString*)value];
     }
     return nil;
 }
 
 - (NSArray*)arrayWithIndex:(NSUInteger)index
 {
     id value = [self objectWithIndex:index];
     if (value == nil || value == [NSNull null])
     {
         return nil;
     }
     if ([value isKindOfClass:[NSArray class]])
     {
         return value;
     }
     return nil;
 }
 
 
 - (NSDictionary*)dictionaryWithIndex:(NSUInteger)index
 {
     id value = [self objectWithIndex:index];
     if (value == nil || value == [NSNull null])
     {
         return nil;
     }
     if ([value isKindOfClass:[NSDictionary class]])
     {
         return value;
     }
     return nil;
 }
 
 - (NSInteger)integerWithIndex:(NSUInteger)index
 {
     id value = [self objectWithIndex:index];
     if (value == nil || value == [NSNull null])
     {
         return 0;
     }
     if ([value isKindOfClass:[NSString class]] || [value isKindOfClass:[NSNumber class]])
     {
         return [value integerValue];
     }
     return 0;
 }
 
 - (float)floatWithIndex:(NSUInteger)index
 {
     id value = [self objectWithIndex:index];
     
     if (value == nil || value == [NSNull null])
     {
         return 0;
     }
     if ([value isKindOfClass:[NSNumber class]] || [value isKindOfClass:[NSString class]])
     {
         return [value floatValue];
     }
     return 0;
 }
 
 
 - (CGFloat)CGFloatWithIndex:(NSUInteger)index
 {
     id value = [self objectWithIndex:index];
     
     CGFloat f = [value doubleValue];
     
     return f;
 }
 
 - (CGPoint)pointWithIndex:(NSUInteger)index
 {
     id value = [self objectWithIndex:index];
 
     CGPoint point = CGPointFromString(value);
     
     return point;
 }
 - (CGSize)sizeWithIndex:(NSUInteger)index
 {
     id value = [self objectWithIndex:index];
 
     CGSize size = CGSizeFromString(value);
     
     return size;
 }
 - (CGRect)rectWithIndex:(NSUInteger)index
 {
     id value = [self objectWithIndex:index];
     
     CGRect rect = CGRectFromString(value);
     
     return rect;
 }
 @end
 
 
 @implementation NSMutableArray (SafeAccess)
 -(void)addObj:(id)i{
     if (i!=nil) {
         [self addObject:i];
     }
 }
 -(void)addString:(NSString*)i
 {
     if (i!=nil) {
         [self addObject:i];
     }
 }
 -(void)addBool:(BOOL)i
 {
     [self addObject:@(i)];
 }
 -(void)addInt:(int)i
 {
     [self addObject:@(i)];
 }
 -(void)addInteger:(NSInteger)i
 {
     [self addObject:@(i)];
 }
 
 -(void)addCGFloat:(CGFloat)f
 {
    [self addObject:@(f)];
 }
 
 -(void)addFloat:(float)i
 {
     [self addObject:@(i)];
 }
 -(void)addPoint:(CGPoint)o
 {
     [self addObject:NSStringFromCGPoint(o)];
 }
 -(void)addSize:(CGSize)o
 {
    [self addObject:NSStringFromCGSize(o)];
 }
 -(void)addRect:(CGRect)o
 {
     [self addObject:NSStringFromCGRect(o)];
 }
 @end