新建一个single view 工程：
关闭ARC , 在.xib视图文件上拖放一个UIImageView 两个UIButton ，一个UISlider ，布局如图。
并为他们连线，
UIImageView 和 UISlider 分别定义插座变量，两个 UIButton 分别 连接两个Action next和previous ，在为 UISlider 连接一个Action 事件。
再在.h 文件中声明两个实例变量。 NSInteger index ; NSMutableArray* arrayPic ; 一个用来记录当前图片的index，一个用来做图片的容器，
用UISlider 来控制图片的透明度 （alpha 属性）。在slider 的界面构建起动作中添加代码，让图片的透明度等于 slider的value。
- (IBAction)sliderChangeValued:(id)sender {
self.imageView.alpha = slider.value;
}
在两个UIButton 的界面构建起动作中添加代码，循环遍历arrayPic中的图片：
- (IBAction)next:(id)sender {
if(index == [arrayPic count]){
index = ;
}
self.imageView.image = [UIImage imageWithContentsOfFile:[arrayPic objectAtIndex:index]];
index++;
}
- (IBAction)previous:(id)sender {
if(index == -){
index = ([arrayPic count] -);
}
self.imageView.image = [UIImage imageWithContentsOfFile:[arrayPic objectAtIndex:index]];
index--;
}
至此：简单的图片查看器已经完成，
整个控制器类中的代码：
//
// wsqViewController.h
// picLook
//
// Created by administrator on 13-9-5.
// Copyright (c) 2013年 __MyCompanyName__. All rights reserved.
// #import <UIKit/UIKit.h> @interface wsqViewController : UIViewController {
UIImageView *imageView;
UISlider *slider;
NSInteger index ;
NSMutableArray* arrayPic ; } @property (retain, nonatomic) IBOutlet UIImageView *imageView;
@property (retain, nonatomic) IBOutlet UISlider *slider;
- (IBAction)sliderChangeValued:(id)sender;
- (IBAction)next:(id)sender; - (IBAction)previous:(id)sender; @end
//
// wsqViewController.m
// picLook
//
// Created by administrator on 13-9-5.
// Copyright (c) 2013年 __MyCompanyName__. All rights reserved.
// #import "wsqViewController.h" @implementation wsqViewController
@synthesize imageView;
@synthesize slider; - (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
} #pragma mark - View lifecycle - (void)viewDidLoad
{
[super viewDidLoad];
//获取mainbudle下所有 jpg格式的图片，
arrayPic = [[NSMutableArray alloc ] initWithArray: [[NSBundle mainBundle] pathsForResourcesOfType:@"jpg" inDirectory:nil]];
index = ;
NSLog(@"%@",arrayPic); } - (void)viewDidUnload
{
[self setImageView:nil];
[self setSlider:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
} - (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
} - (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
} - (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
} - (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
} - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} - (void)dealloc {
[arrayPic release];
[imageView release];
[slider release];
[super dealloc];
}
- (IBAction)sliderChangeValued:(id)sender { self.imageView.alpha = slider.value;
} - (IBAction)next:(id)sender {
if(index == [arrayPic count]){
index = ;
}
self.imageView.image = [UIImage imageWithContentsOfFile:[arrayPic objectAtIndex:index]];
index++;
} - (IBAction)previous:(id)sender {
if(index == -){
index = ([arrayPic count] -);
}
self.imageView.image = [UIImage imageWithContentsOfFile:[arrayPic objectAtIndex:index]];
index--;
}
@end