【项目经验】iphone自定义状态栏

    #import <Foundation/Foundation.h>  
      
      
    //自定义状态栏，状态栏显示灰色背景并【indicator message】。用于耗时操作的状态栏信息提示  
    //例如：访问网络时，提示正在获取网络数据，或者正在提交数据至服务器等提示  
    @interface CHStatusBar : UIWindow {  
        @private  
            UILabel *lblStatus;  
            UIActivityIndicatorView *indicator;  
    }  
      
      
    -(void)showWithStatusMessage:(NSString*)msg;  
    -(void)hide;  
      
      
    @end  

#import "CHStatusBar.h"  
      
      
@implementation CHStatusBar  
      
      
 - (id) initWithFrame:(CGRect)frame{  
        if (self = [super initWithFrame:frame]) {  
// 将窗体置于正确的位置和级别，就是比状态栏的级别稍高即可  
// 否则该窗体会被标准状态栏遮住，相当于web开发的zoom  
            self.windowLevel = UIWindowLevelStatusBar + 1.0f;  
// 使窗体的框架和状态栏框架一致  
            self.frame = [UIApplication sharedApplication].statusBarFrame;  
              
// 创建一个灰色图片背景，使他视觉上还是一个标准状态栏的感觉  
            UIImageView* backgroundImageView = [[UIImageView alloc] initWithFrame:self.frame];  
            backgroundImageView.image = [[UIImage imageNamed:@"statusbar_background.png"] stretchableImageWithLeftCapWidth:2 topCapHeight:0];  
            [self addSubview:backgroundImageView];  
            [backgroundImageView release];  
              
//创建一个progress  
indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];  
            indicator.frame = (CGRect) {  
                .origin.x = 2.0f,   
                .origin.y = 3.0f,   
                .size.width = self.frame.size.height - 6,   
                .size.height = self.frame.size.height - 6  
};  
indicator.hidesWhenStopped = YES;  
[self addSubview:indicator];  
              
//文字信息，用于和用户进行交互，最好能提示用户当前是什么操作  
            lblStatus = [[UILabel alloc] initWithFrame:(CGRect){.origin.x = self.frame.size.height, .origin.y = 0.0f, .size.width = 200.0f, .size.height = self.frame.size.height}];  
            lblStatus.backgroundColor = [UIColor clearColor];  
            lblStatus.textColor = [UIColor blackColor];  
            lblStatus.font = [UIFont boldSystemFontOfSize:10.0f];  
            [self addSubview:lblStatus];          
        }  
        return self;  
}  
      
      
- (void) showWithStatusMessage:(NSString*) msg {  
        if (!msg) return;  
        lblStatus.text = msg;  
        [indicator startAnimating];  
        self.hidden = NO;  
}  
      
      
- (void) hide {  
        [indicator stopAnimating];  
        self.hidden = YES;  
 }  
      
      
 - (void) dealloc {  
        [lblStatus release];  
        [indicator release];  
        [super dealloc];  
}  
      
      
@end  

自定义状态栏就搞定了。