如何在按钮单击时加载UIView

Question

I have Seprate UIView which i am using in UIViewController it initially loads but i want that when that is loaded and I again click on the button then it should reload because it has graph creation method which draws graph when view loaded

  #import <UIKit/UIKit.h> 
  #import "ECGraph.h"
  #import "ECGraphItem.h"
  #import "CereniaAppDelegate.h"
  @class GraphsViewController;
  @interface Display : UIView {

NSArray *percentages;
CereniaAppDelegate*appDelegate;
}
  @property(nonatomic,retain)NSArray*percentages;

  -(void) setPercentageArray:(NSArray*) array;
  @end

Implementation files

 #import "Display.h"
 #import "ECGraph.h"
 #import "CereniaAppDelegate.h"
 @implementation Display
 @synthesize percentages;
 - (id)initWithFrame:(CGRect)frame {
 self = [super initWithFrame:frame];
 if (self) {
  }
 return self;
 }

- (void)drawRect:(CGRect)rect {

 CGContextRef _context = UIGraphicsGetCurrentContext();


 ECGraph *graph = [[ECGraph alloc] initWithFrame:CGRectMake(70,-70,800,200) withContext:
                  _context isPortrait:NO];

    appDelegate=[[UIApplication sharedApplication]delegate];


ECGraphItem *item1 = [[ECGraphItem alloc] init];

ECGraphItem *item2 = [[ECGraphItem alloc] init];    

ECGraphItem *item3 = [[ECGraphItem alloc] init];
    item1.isPercentage = YES;

int value=(int)roundf(appDelegate.graphValueOne);
item1.yValue=value;
item1.width = 70;
item1.name = @"Unvaccinated horse"; 

int value1=(int)roundf(appDelegate.graphValueTwo);

item2.isPercentage = YES;
item2.yValue=value1;
item2.width = 70; 

item2.name = @"Annually Vaccinated horse";

int value3=(int)roundf(appDelegate.graphValueThree);
item3.isPercentage = YES;
item3.yValue=value3;

item3.width = 70;
item3.name = @"Semi-Annually vaccinated horse";






NSArray *items = [[NSArray alloc] initWithObjects:item1,item2,item3,nil];
[graph setXaxisTitle:@""];
[graph setYaxisTitle:@"Risk"];
[graph setDelegate:self];
[graph setBackgroundColor:[UIColor lightGrayColor]];
[graph drawHistogramWithItems:items lineWidth:2 color:[UIColor blackColor]];


    }
  -(void) setPercentageArray:(NSArray*) array


    {


percentages = array;


NSString*test=[percentages objectAtIndex:0];

NSLog(test);


     }



- (void)dealloc {
   [super dealloc];
    }

   @end

Answer 1

You can get any view to redraw with

[view setNeedsDisplay];

So on your refresh button you would update the data used by the Display class and then setNeedsDisplay.