一、網上下載  MBProgessHUD 類檔案，直接匯入到工程

MBProgressHUD 下載地址是： http://github.com/matej/MBProgressHUD

二、在我的工程中示例如下：

1）在ShowImageViewController.h標頭檔案程式碼如下：

#import <UIKit/UIKit.h>

#import "MBProgressHUD.h"

@interface ShowImageViewController : UIViewController <MBProgressHUDDelegate>{

    NSString         *_picUrlString;

    UIImageView      *_imageView;

    MBProgressHUD    *_progressHUD; 

}

@property (nonatomic, copy) NSString           *picUrlString;

@property (nonatomic, retain) IBOutletUIImageView *imageView;

@property (nonatomic, retain) MBProgressHUD    *progressHUD;

//請求圖片資源

-(void)imageResourceRequest;

//顯示圖片資訊

-(void)displayImage:(UIImage *)image;

- (IBAction)dismissModealView:(id)sender;

-(void)removeModalView;

@end

2）在ShowImageViewController.m實現檔案程式碼如下：

#import "ShowImageViewController.h"

#import <QuartzCore/QuartzCore.h>

@implementation ShowImageViewController

@synthesize

@synthesize imageView = _imageView;

@synthesize progressHUD = _progressHUD;

- (void)viewDidLoad

{

    [superviewDidLoad];

// Do any additional setup after loading the view from its nib.

self.view.backgroundColor = [UIColorgrayColor];

    self.view.alpha = 0.8;

//設定圖片為圓角

    self.imageView.backgroundColor = [UIColor clearColor];

    self.imageView.layer.borderColor = [UIColor lightGrayColor].CGColor;

    self.imageView.layer.borderWidth = 5.0;

    self.imageView.layer.masksToBounds = YES; 

    self.imageView.layer.cornerRadius = 10.0; 

}

-(void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

//當進入檢視時，重新設定imageView

    [self.imageView setImage:nil];

    [self.imageView setFrame:CGRectMake(160, 200, 0, 0)];

//顯示載入等待框

    self.progressHUD = [[MBProgressHUD alloc] initWithView:self.view];

    [self.view addSubview:self.progressHUD];

    [self.view bringSubviewToFront:self.progressHUD];

    self.progressHUD.delegate = self;

    self.progressHUD.labelText = @"載入中...";

    [self.progressHUD show:YES];

//開啟執行緒，請求圖片資源

    [NSThreaddetachNewThreadSelector:@selector(imageResourceRequest) toTarget:selfwithObject:nil];

}

//請求圖片資源

-(void)imageResourceRequest

{

NSAutoreleasePool   *pool = [[NSAutoreleasePoolalloc] init];

//根據網路資料，獲得到image資源

    NSData  *data = http://www.cnblogs.com/snake-hand/archive/2012/08/13/[[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:self.picUrlString]];

    UIImage *image = [[UIImage alloc] initWithData:data];

    [data release];

//回到主執行緒，顯示圖片資訊

    [selfperformSelectorOnMainThread:@selector(displayImage:) withObject:imagewaitUntilDone:NO];

    [image release];

    [pool release];

}

//顯示圖片資訊

-(void)displayImage:(UIImage *)image

{

//若self.progressHUD為真，則將self.progressHUD移除，設為nil

    if (self.progressHUD){

        [self.progressHUD removeFromSuperview];

        [self.progressHUD release];

        self.progressHUD = nil;

    }

//圖片慢慢放大動畫效果

    [self.imageView setImage:image];

    [UIViewbeginAnimations:nilcontext:nil];

    [UIViewsetAnimationDuration:0.5];

    [self.imageView setFrame:CGRectMake(40, 100, 240, 160)];

    [UIViewcommitAnimations];

}

- (void)viewDidUnload

{

    [selfsetImageView:nil];

    [superviewDidUnload];

// Release any retained subviews of the main view.

// e.g. self.myOutlet = nil;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

// Return YES for supported orientations

    return (interfaceOrientation == UIInterfaceOrientationPortrait);

}

- (IBAction)dismissModealView:(id)sender {   

//設定定時器，當動畫結束時，子檢視從父檢視中移除

    [NSTimerscheduledTimerWithTimeInterval:0.5target:selfselector:@selector(removeModalView) userInfo:nilrepeats:NO];

    [UIViewbeginAnimations:nilcontext:nil];

    [UIViewsetAnimationDuration:0.5];

    [self.imageView setFrame:CGRectMake(160, 200, 0, 0)];

    [UIViewcommitAnimations];

}

-(void)removeModalView

{

    [self.viewremoveFromSuperview];

}

#pragma mark -

#pragma mark MBProgressHUDDelegate methods

- (void)hudWasHidden:(MBProgressHUD *)hud {

    NSLog(@"Hud: %@", hud);

// Remove HUD from screen when the HUD was hidded

    [self.progressHUD removeFromSuperview];

    [self.progressHUD release];

    self.progressHUD = nil;

}

- (void)dealloc

{

    [_picUrlString release];

    [_imageView release];

    [super dealloc];

}

@end