plantpurecode

@interface JRObject : NSObject @end

@implementation JRObject

- (void)doesNotRecognizeSelector:(SEL)selector {
   NSLog(@"Attempted to invoke %s on %@", selector, self);
}

@end

plantpurecode

@interface NSArray (JRAdditions)

- (id) safeObjectAtIndex:(NSUInteger)index;

@end

@implementation NSArray (JRAdditions)

- (id) safeObjectAtIndex:(NSUInteger)index {
   @synchronized(self) {

plantpurecode

@implementation NSIndexPath (JRAdditions)

- (NSIndexPath *) indexPathByAddingRows:(NSInteger)rows andSections:(NSInteger)sections {
    NSIndexPath *newIndexPath = [NSIndexPath indexPathForRow:MIN(NSIntegerMax, [self row] + rows)
                                                   inSection:MIN(NSIntegerMax, [self section] + sections)];
    return newIndexPath;
}

- (NSIndexPath *) indexPathByAddingRows:(NSInteger) rows {
    return [self indexPathByAddingRows:rows andSections:0];

plantpurecode

//GCD way:

double delayInSeconds = (24 * 60) * 60;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    [self setAge:[self age] + 1];
});


//NSInvocation way:

plantpurecode

@interface UIView (JRHierarchyAdditions) 
- (void)bringToFront;
- (void)sendToBack;
@end

@implementation UIView (JRHierarchyAdditions)
   
- (void)bringToFront {
   [[self superview] bringSubviewToFront:self];
}