IOS开发UI篇之──自定义加载等待框（MBProgressHUD）

<UIKit/UIKit.h>
"MBProgressHUD.h"
UIViewControllerMBProgressHUDDelegate            }
nonatomiccopyNSString@propertynonatomicretainIBOutlet@propertynonatomicretainMBProgressHUD//



-(@end
imageView
    [self.imageView setImage:nil];
    [self.imageView setFrame:CGRectMake(160, 200, 0, 0)];
    //显示加载等待框
    self.progressHUD = [[MBProgressHUD alloc] initWithView:self.view];
[self.view addSubview:self.progressHUD];
[self.view bringSubviewToFront:self.progressHUD];
self.progressHUD.delegate = self;
self.progressHUD.labelText = @"加载中...";
[self.progressHUD show:YES];

    //开启线程，请求图片资源
    [NSThread detachNewThreadSelector:@selector(imageResourceRequest) toTarget:self withObject:nil];
}
//请求图片资源
-(void)imageResourceRequest
{
    NSAutoreleasePool   *pool = [[NSAutoreleasePool alloc] init];
    //根据网络数据，获得到image资源
    NSData  *data = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:self.picUrlString]];
    UIImage *image = [[UIImage alloc] initWithData:data];
    [data release];
    //回到主线程，显示图片信息
    [self performSelectorOnMainThread:@selector(displayImage:) withObject:image waitUntilDone:NO];
    [image release];


    [pool release];
}
//显示图片信息
-(void)displayImage:(UIImage *)image
{
    //若self.progressHUD为真，则将self.progressHUD移除，设为nil
    if (self.progressHUD){
        [self.progressHUD removeFromSuperview];
        [self.progressHUD release];
        self.progressHUD = nil;
    }

    //图片慢慢放大动画效果
    [self.imageView setImage:image];
    [UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[self.imageView setFrame:CGRectMake(40, 100, 240, 160)];
[UIView commitAnimations];

}
- (void)viewDidUnload
{
    [self setImageView:nil];
    [super viewDidUnload];
    // 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 {   
    //设置定时器，当动画结束时，子视图从父视图中移除
    [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(removeModalView) userInfo:nil repeats:NO];

    [UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
[self.imageView setFrame:CGRectMake(160, 200, 0, 0)];
[UIView commitAnimations];

}
-(void)removeModalView
{
    [self.view removeFromSuperview];
}
#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

三、效果展示
四、总结
利用MBProgressHUD实现加载等待框，视觉效果大大提高

图片:自定义加载等待框（MBProgressHUD）.png