現在你只要拿着手機,不管你Android還是iOS,新聞類的App不可避免都有一個功能就是圖片查看,做個專題,查看一下內容,App Store中也有專門針對圖片瀏覽的App,鑒於目前所知有限,無法做到那么高大上的App,簡單的做個美女查看的Demo。沒有太多的功能,上一張,下一張,標簽,圖片,簡簡單的,深刻的感覺到知識就是力量,目前知識有限的結果就是Demo簡單,且學且珍惜吧。
1.新建項目(如果不會可以參考本人之前的文章),然后在StoryBoard中進行布局,將Girl文件夾中的圖片拖入項目中;

2.將UIImageView,UILabel,UIButton拖入StoryBoard中,並且設置背景圖片;

設置背景圖片:

3.ViewController.h中定義成員變量:
#import <UIKit/UIKit.h> @interface ViewController : UIViewController @property (weak, nonatomic) IBOutlet UIImageView *imageView; @property (weak, nonatomic) IBOutlet UILabel *pageLabel; @end
4.上一張和下一張的事件代碼:
定義一個圖片數組:
@interface ViewController ()
@property NSArray *imageArr;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_imageArr=@[@"girl0.jpg",@"girl1.jpg",@"girl2.jpg"];
}
上一張的代碼:
//顯示上一張
- (IBAction)preview:(id)sender {
NSInteger currentIndex=[[[_pageLabel text] substringToIndex:1] integerValue];
NSInteger allCount=[_imageArr count];
if (currentIndex==1) {
currentIndex=allCount;
}else{
currentIndex=currentIndex-1;
}
//設置標簽
[_pageLabel setText:[NSString stringWithFormat:@"%ld/%ld",currentIndex,(long)allCount]];
//獲取圖片的名稱
NSString *imageName=[NSString stringWithFormat:@"girl%ld.jpg",(long)currentIndex-1];
UIImage *image=[UIImage imageNamed:imageName];
[_imageView setImage:image];
}
下一張代碼:
//顯示下一張
- (IBAction)nextView:(id)sender {
//截取標簽上面的數字
NSInteger currentIndex=[[[_pageLabel text] substringToIndex:1] integerValue];
NSInteger allCount=[_imageArr count];
if (currentIndex==allCount) {
currentIndex=0;
}
NSString *imageName=[NSString stringWithFormat:@"girl%ld.jpg",(long)currentIndex];
[_pageLabel setText:[NSString stringWithFormat:@"%ld/%ld",currentIndex+1,(long)allCount]];
UIImage *image=[UIImage imageNamed:imageName];
[_imageView setImage:image];
}
以上的代碼基本上都是OC基礎,UIImage設置圖片的時候只需要傳遞一下圖片名稱即可,不需要傳遞路徑;
5.最終效果如下:

效果很簡單,就是在上一張和下一張到臨界點的時候判斷一下,兩者的代碼類似,其實可以封裝一下,周末愉快;
ViewController.m中的代碼:
//
// ViewController.m
// MyPicture
//
// Created by keso on 15/1/17.
// Copyright (c) 2015年 keso. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
@property NSArray *imageArr;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_imageArr=@[@"girl0.jpg",@"girl1.jpg",@"girl2.jpg"];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//顯示上一張
- (IBAction)preview:(id)sender {
NSInteger currentIndex=[[[_pageLabel text] substringToIndex:1] integerValue];
NSInteger allCount=[_imageArr count];
if (currentIndex==1) {
currentIndex=allCount;
}else{
currentIndex=currentIndex-1;
}
//設置標簽
[_pageLabel setText:[NSString stringWithFormat:@"%ld/%ld",currentIndex,(long)allCount]];
//獲取圖片的名稱
NSString *imageName=[NSString stringWithFormat:@"girl%ld.jpg",(long)currentIndex-1];
UIImage *image=[UIImage imageNamed:imageName];
[_imageView setImage:image];
}
//顯示下一張
- (IBAction)nextView:(id)sender {
//截取標簽上面的數字
NSInteger currentIndex=[[[_pageLabel text] substringToIndex:1] integerValue];
NSInteger allCount=[_imageArr count];
if (currentIndex==allCount) {
currentIndex=0;
}
NSString *imageName=[NSString stringWithFormat:@"girl%ld.jpg",(long)currentIndex];
[_pageLabel setText:[NSString stringWithFormat:@"%ld/%ld",currentIndex+1,(long)allCount]];
UIImage *image=[UIImage imageNamed:imageName];
[_imageView setImage:image];
}
@end
