等待动画的实现

头文件：

 

#import <UIKit/UIKit.h>

@interface AlertViewController : UIViewController <UIWebViewDelegate> {
	UIWebView *webView;
	UIAlertView *alert; 
}

@property (nonatomic, retain) IBOutlet UIWebView *webView;
@property (nonatomic, retain) UIAlertView *alert; 

- (void) NavURL;

@end

 

实现文件：

 

#import "AlertViewController.h"

@implementation AlertViewController

@synthesize webView, alert;

-(void) NavURL{
	[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://2015.iteye.com"]]];
}

- (void)webViewDidStartLoad:(UIWebView *)webView {
	if (alert == nil){                
		alert = [[UIAlertView alloc] initWithTitle: nil
																			 message: @"正在读取网络数据"
																			delegate: self
														 cancelButtonTitle: nil
														 otherButtonTitles: nil];
	}
	UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
	activityView.frame = CGRectMake(120.f, 48.0f, 37.0f, 37.0f);
	[alert addSubview:activityView];
	[activityView startAnimating];
	[activityView release];
	[alert show];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView {
	[alert dismissWithClickedButtonIndex:0 animated:YES];
}

- (void)viewDidLoad {
	[super viewDidLoad];
	[self NavURL];
}

- (void)dealloc {
	[super dealloc];
	[webView release];
	[alert release];
	webView = nil;
	alert = nil;
}

@end

 

示例图：