[IOS執行個體小計]計數器--啟示就是簡單的按鈕方法操作，主要學習目的時增加圖片顯示

直接上代碼： //  //  CountMeViewController.h  //  ImageView  //  //  Created by zhang xujun on 13-9-9.  //  Copyright (c) 2013年 zhang xujun. All rights reserved.  //    #import <UIKit/UIKit.h>    @interface CountMeViewController : UIViewController      @property (strong,nonatomic) IBOutlet UIButton *returnSuperView;  @property (strong,nonatomic) IBOutlet UILabel *countLabel;  @property (strong,nonatomic) IBOutlet UIButton *add;  @property (strong,nonatomic) IBOutlet UIButton *sub;  @property (strong,nonatomic) IBOutlet UIButton *reset;  -(IBAction)returnSuperView:(id)sender;  -(IBAction)countAdd:(id)sender;  -(IBAction)countSub:(id)sender;  -(IBAction)reset:(id)sender;  @end  //  //  CountMeViewController.m  //  ImageView  //  //  Created by zhang xujun on 13-9-9.  //  Copyright (c) 2013年 zhang xujun. All rights reserved.  //    #import "CountMeViewController.h"    @interface CountMeViewController ()    @end    @implementation CountMeViewController  @synthesize  returnSuperView;  @synthesize countLabel;  @synthesize add;  @synthesize sub;  @synthesize reset;    int count = 0;    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil  {      self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];      if (self) {          // Custom initialization      }      return self;  }    - (void)viewDidLoad  {      [super viewDidLoad];      self.countLabel.text = @"0";        }  -(void)countAdd:(id)sender{        if (count>=99) {          return;      }      NSString *addCount = [[NSString alloc] initWithFormat:@"%d",++count];      self.countLabel.text = addCount;              }  -(void)countSub:(id)sender{        if (count<=0) {          return;      }      NSString *subCount = [[NSString alloc] initWithFormat:@"%d",--count];      self.countLabel.text = subCount;        }  -(void)reset:(id)sender{        count = 0;      self.countLabel.text = @"0";        }  -(void)returnSuperView:(id)sender{        [self.view removeFromSuperview];  }  - (void)didReceiveMemoryWarning  {      [super didReceiveMemoryWarning];        }    @end