Iphone 显示 “正在加载”

ActivityView.h
#import
　#define kAnimationDurationStart 2
   #define kAnimationDurationEnd 1
   @interface ActivityView : NSObject {
    IBOutlet UILabel *messageLabel;
    IBOutlet UIView *view;
    BOOL isShow;
}
　@property (nonatomic, readonly) UILabel *messageLabel;
　@property (nonatomic, readonly) UIView *view;　
  @property (nonatomic) BOOL isShow;　
   + (ActivityView *)sharedActivityView; 　
　- (void)showWithMessage:(NSString *)message animate:(BOOL)animate;　
　- (void)hide:(BOOL)animate;     
 @end
ActivityView.m
#import "ActivityView.h"　
　@implementation ActivityView　
　@synthesize messageLabel,view, isShow; 　
　//单例模式　　
static ActivityView *activityView; 　
　- (id) init {　
           　self = [super init];　
          　if (self != nil) {　
             　  [[NSBundle mainBundle] loadNibNamed:@"ActivityView" owner:self options:nil];　
             　  [[[UIApplication sharedApplication] keyWindow] addSubview:view];　　
                  [view setFrame:CGRectMake(0, [UIApplication sharedApplication].statusBarFrame.size.height-view.frame.size.height, view.frame.size.width, view.frame.size.height)];　
           　  isShow = NO;　　
      }　　return self;　
　} 　
　+ (ActivityView *)sharedActivityView {　  
    　if (!activityView) {　　
         activityView = [[ActivityView alloc]init];　　
}　　
       return activityView;　
　} 　
　- (void)showWithMessage:(NSString *)message animate:(BOOL)animate {　
       　isShow = YES;　
       　messageLabel.text = message;　
       　[view.superview bringSubviewToFront:view];
}




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