LoadingView

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//

//  LoadingView.h

//  蓝桥播报

//

//  Created by 小小建 on 15/7/10.

//  Copyright (c) 2015年 蓝桥. All rights reserved.

//

#import <Foundation/Foundation.h>

#import <UIKit/UIKit.h>

@interface LoadingView : NSObject

{

    UIView *_backGroundView;

    UIView *_centerLoadingView;

    UIActivityIndicatorView *_activityView;

}

+(LoadingView *)shareLoadingView;

-(void)show;

-(void)hide;

@end

//

//  LoadingView.m

//  蓝桥播报

//

//  Created by 小小建 on 15/7/10.

//  Copyright (c) 2015年 蓝桥. All rights reserved.

//

#import "LoadingView.h"

#import "AppDelegate.h"

static LoadingView *singleInstance=nil;

@implementation LoadingView

+(LoadingView *)shareLoadingView{

    @synchronized(self){

        if (singleInstance==nil) {

            singleInstance=[[self alloc] init];

        }

    }

    return singleInstance;

}

-(void)show{

    AppDelegate *delegate=(AppDelegate *)[UIApplication sharedApplication].delegate;

    _backGroundView=[[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];

    [_backGroundView setBackgroundColor:[UIColor blackColor]];

    _backGroundView.alpha=0.6;

    [delegate.window addSubview:_backGroundView];

    _centerLoadingView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 150, 150)];

    _centerLoadingView.center=CGPointMake([UIScreen mainScreen].bounds.size.width/2, [UIScreen mainScreen].bounds.size.height/2);

    UIImageView *imgView=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 150, 150)];

    [imgView setImage:[UIImage imageNamed:@"loading_bg.png"]];

    _activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

    _activityView.center = CGPointMake(imgView.frame.size.width/2, imgView.frame.size.height/2-20);

    _activityView.hidesWhenStopped = YES;

    [_activityView startAnimating];

    [imgView addSubview:_activityView];

    UILabel *labelInfo = [[UILabel alloc] initWithFrame:CGRectMake(0,0, 140, 60)];

    labelInfo.center=CGPointMake(imgView.frame.size.width/2, imgView.frame.size.height/2+20);

    labelInfo.numberOfLines = 2;

    labelInfo.backgroundColor = [UIColor clearColor];

    labelInfo.textAlignment = NSTextAlignmentCenter;

    labelInfo.textColor = [UIColor whiteColor];

    labelInfo.font = [UIFont systemFontOfSize:16];

    labelInfo.text=@"加载中...";

    [imgView addSubview:labelInfo];

    [_centerLoadingView addSubview:imgView];

    [delegate.window addSubview:_centerLoadingView];

}

-(void)hide{

    [_activityView stopAnimating];

    [_centerLoadingView removeFromSuperview];

    [_backGroundView removeFromSuperview];

}

@end

LoadingView

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原文地址：http://www.cnblogs.com/xiao-xiao-jian/p/4977120.html