A Navigation Controller manages a stack of view controllers to provide a drill-down interface for hierarchical content. The view hierarchy of a navigation controller is self contained. It is composed of views that the navigation controller manages directly and views that are managed by CONTENT VIEW CONTROLLERS you provide. Each content view controller manages a distinct view hierarchy, and the navigation controller coordinates the navigation between these view hierarchies.

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.h file:-

# import

#import “Second view .h”

@ interface rout view controller: UI table view controller

{

NSMutable Array * aArray;

}

@ end

.m file:-

# import “Root viewController. h”

@ implementation RoutviewController

# program mark view life cycle:

-(void) view Didload

{

[ Super viewDidLoad];

AArray = [[ NSMutableArray alloc] initWithObjects:

@ “one”, @ “two”, @ “three”, @ “four”, @ “five”, nil];

[ array retain];

Self title = @ “ Navigation Based”;

Self . navigationItem . rightBarButtonItem = self. editButtonItem;

// add method:

UI BarButton item * leftButtonItem = [[ UIButtonItem alloc]

InitwithTitle : @ “add”

Style : UIBar ButtonItemStyle Bordered

Target : self

Action : @ selector ( Add click)];

Self . navigationItem . leftBarButtonItem. LeftBarButtonItem

}

-(void) add click

{
[ a Array addObject : @ “hello”];

[ self. table view reload Data];

}

# program mark-

# program mark table view data source:

-(NSInteger) numberofSectionIn Tableview : (UI Table view *) table view
{
Rreturn 1;
}

-(UITable view cell *) table view : (UITableview *) table view
CellForRowAtIndexPath: (NSIndex path *) indexpath
{
Static NSString * cell Identifier = @ “cell”;
UITable view cell * cell = [ table view
DequeueReusableCellWithIdentifier : cellIdentifier];
If (cell = = nil)
{
Cell = [[[UITableviewcell alloc] init with style:
UI Table view cell Style Default reuseIdentifier : cell Identifier
Auto release];
}
[cell setAccessory Type: UITableviewcellAccessory
DisclosureIndicator];
Cell. textLabel. Text = [aArray object At Index: indexpath.row];
Return cell;
}
-(NSInteger) table view: (UITable view *) table view
NumberofRowsInSection : (NSInteger) section
{
Return [ array count];
}

-(void) table view: (UITable view *) table view
Commit editing Style:(UITableviewcellEditingStyle)
Editing style for RowAtIndexPath:(NSIndePath *)index path
{
If (editing style = = UITable view cell editing style delete)
{

delete the row from the data source:

[ aArray removeObjectAtIndex: indexpath.row];
[ tableview deleteRowAtIndexpaths : [NSArray
Array with object: index path]
With row animation: UITableViewRowAnimationFade];
}
Else if (editing style = = UITableviewcellEditingStyleInsert)
{
}
}

# program mark:-

# program mark memory management ( Table view Delegate)

-(void) table view: (UITable view *) table view
DidselectRow At Indexpath: ( NSIndex path *) index path
{
NSLog ( @ “didSelectRowAtIndexPath called”);
Second view * secondviewController = [[ secondview alloc]
InitWithNibNames: @ “second view” bundle :nil];
[self. NavigationController pushviewController: secondviewController animated : yes];
}

Second view .h:-

# import
@ interface second view: UITable viewController
{
}
@end

Capture 15Second view . m:-

@ implementation secondview

# program mark view life cycle:

-(void) view did load
{
[Super viewDidLoad];
Self . title = @ “Second view”;

How To Add Bar Button Dynamically:

UIBarButtonItem * leftBarButtonItem =
[[UIBarButtonItem alloc] initWithTitle:@ “Back”

Style: UIBarButtonItem style Bordered target: self

Action : @ selector (back)];

Self. Navigation Item .leftBarButtonItem = leftBarButtonItem;
Self. Navigation Item. RightBarButtonItem = self. edit ButtonItem;
}
-(void) Back
{

[self. NavigationController popviewControllerAnimated :YES];
}

# program mark table view data source:

-(NSInteger) number of sections in Table view:
(UITable view *) table view
{
return 1;
}

-(NSInteger) table view: (UITable view *) table view
Number ofRowsInsection : ( NSInteger) Section
{
Return 4;
}

-(UITable view cell *) table view :(UITable view *)
Table view cellForRowAtIndex path :(NSIndex *)index path
{
Static NSString * cellIdentifier = @ “cell”;
UITable cell * cell= [table view
Dequeusable cell withIdentifier: cellIdentifier]
If (cell = nil)
{
Cell = [[[ u Tableview cell alloc] init with style:
UITable view cell Style De fault reuseIdentifier:
Cell identifier] auto release];
}
Cell table text. Text= @ “hello”;
Return cell;
}

Image picker view with UI image view and ns mutable array:-

.h file:-

# import

@ interface divpickerviewController : UIview controller
{
IBoutlet UIImage view * img view;
IBoutlet UIpicker view *Pview;
NSMutableArray * aArray;
}
@end

.m file:-

-(void) view Didload
{
P view . delegate = self;
P view . data source = self;
aArray = [[NSMutable Array alloc]
InitWithObjects: @ “blue” @ “red” @ “green” @ “pink”, @ “yellow”, nil];
[ super view DidLoad];
}

-(NSInteger) number of components in picker view:

(UI picker view *) picker view
{
return 1;
}

-(NSInteger) picker view: (UIPicker view *) picker view

NumberOfRowsInComponent :(NSInteger) component
{
return [ aArray count];
}
-(NSString *) picker view. ( UIpickerview *) pickerview
Title forRow : (NSInteger) row for Component:
(NSInteger)Component
{
return [ array objectAtIndex :row];
}
-(CG Float) pickerview: (UIpickerview *) picker view
row heightForComponent (NSInteger) Component
{
return 150;
}
-(UIView *) picker view : (UIPickerview *) pickerview
ViewForRow: (NSInteger)row forComponent:
(NSInteger)Component reusing view: (UI view *)view
{
Imgview =[[ UIImage view alloc] initWithFrame:
CGRectMake (100,80,100,70)];
Imgview. Image = UIImage imageNamed:
@ “hollowoody2.gif”];
return imgview;
}
-(void) pickerview: (UIpickerview *) pickerview
DidselectRow: (NSInteger) row in Component:
(NSInteger) Component
{
NSLog (@ “did SelectRow is called and row is %d
Row is %d and Component is %d”, row, component);
}

Frequently Asked iPhone Interview Questions & Answers

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Last updated: 29 Jan 2021

About Author

Ravindra Savaram

Ravindra Savaram is a Content Lead at Mindmajix.com. His passion lies in writing articles on the most popular IT platforms including Machine learning, DevOps, Data Science, Artificial Intelligence, RPA, Deep Learning, and so on. You can stay up to date on all these technologies by following him on LinkedIn and Twitter.

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