创建一个UIViewController的分类UIViewController+HUD

UIViewController+HUD.h

#import <UIKit/UIKit.h>

typedef void(^completionBlock)(void);
@interface UIViewController (HUD)
-(void)showSuccess:(NSString *)success;
-(void)showError:(NSString *)error;
-(void)showMessage:(NSString *)message afterDelay:(NSTimeInterval)timer;
-(void)showMessage:(NSString *)message afterDelay:(NSTimeInterval)timer completion:(completionBlock)completion;
-(void)showWaiting;
-(void)showLoading;
-(void)showLoadingWithMessage:(NSString *)message;
-(void)showSaving;
-(void)hideHUD;

@end

UIViewController+HUD.m

#import "UIViewController+HUD.h"

@implementation UIViewController (HUD)
-(void)showSuccess:(NSString *)success
{
    MBProgressHUD *HUD=[[MBProgressHUD alloc]initWithView:[self getView]];
    HUD.contentColor=[UIColor whiteColor];
    HUD.bezelView.color=[UIColor blackColor];
    HUD.mode=MBProgressHUDModeText;
    HUD.label.text=success;
    HUD.removeFromSuperViewOnHide=YES;
    [[self getView] addSubview:HUD];
    [HUD showAnimated:YES];
    [HUD hideAnimated:YES afterDelay:1];
}
-(void)showError:(NSString *)error
{
    MBProgressHUD *HUD=[[MBProgressHUD alloc]initWithView:[self getView]];
    HUD.contentColor=[UIColor whiteColor];
    HUD.bezelView.color=[UIColor blackColor];
    HUD.mode=MBProgressHUDModeText;
    HUD.label.text=error;
    HUD.removeFromSuperViewOnHide=YES;
    [[self getView] addSubview:HUD];
    [HUD showAnimated:YES];
    [HUD hideAnimated:YES afterDelay:1];
}
-(void)showMessage:(NSString *)message afterDelay:(NSTimeInterval)timer
{
    MBProgressHUD *HUD=[[MBProgressHUD alloc]initWithView:[self getView]];
    HUD.contentColor=[UIColor whiteColor];
    HUD.bezelView.color=[UIColor blackColor];
    HUD.mode=MBProgressHUDModeText;
    HUD.label.text=message;
    HUD.label.numberOfLines = 0;
    HUD.removeFromSuperViewOnHide=YES;
    [[self getView] addSubview:HUD];
    [HUD showAnimated:YES];
    [HUD hideAnimated:YES afterDelay:timer];
}

-(void)showMessage:(NSString *)message afterDelay:(NSTimeInterval)timer completion:(completionBlock)completion
{
    MBProgressHUD *HUD=[[MBProgressHUD alloc]initWithView:[self getView]];
    HUD.contentColor=[UIColor whiteColor];
    HUD.bezelView.color=[UIColor blackColor];
    HUD.mode=MBProgressHUDModeText;
    HUD.label.text=message;
    HUD.label.numberOfLines = 0;
    HUD.removeFromSuperViewOnHide=YES;
    [[self getView] addSubview:HUD];
    [HUD showAnimated:YES];
    [HUD hideAnimated:YES afterDelay:timer];
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(timer * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        if (completion) {
            completion();
        }
    });
}
-(void)showWaiting
{
    MBProgressHUD *HUD=[[MBProgressHUD alloc]initWithView:[self getView]];
    HUD.backgroundView.color = [UIColor colorWithWhite:0.f alpha:.2f];
    HUD.bezelView.color = [UIColor blackColor];
    HUD.contentColor=[UIColor whiteColor];
    HUD.removeFromSuperViewOnHide=YES;
    [[self getView] addSubview:HUD];
    [HUD showAnimated:YES];
}
-(void)showLoading
{
    MBProgressHUD *HUD=[[MBProgressHUD alloc]initWithView:[self getView]];
    HUD.backgroundView.color = [UIColor colorWithWhite:0.f alpha:.2f];
    HUD.bezelView.color = [UIColor blackColor];
    HUD.contentColor=[UIColor whiteColor];
    HUD.label.text=@"正在加载";
    HUD.removeFromSuperViewOnHide=YES;
    [[self getView] addSubview:HUD];
    [HUD showAnimated:YES];
}
-(void)showLoadingWithMessage:(NSString *)message
{
    MBProgressHUD *HUD=[[MBProgressHUD alloc]initWithView:[self getView]];
    HUD.backgroundView.color = [UIColor colorWithWhite:0.f alpha:.2f];
    HUD.bezelView.color = [UIColor blackColor];
    HUD.contentColor=[UIColor whiteColor];
    HUD.label.text=message;
    HUD.removeFromSuperViewOnHide=YES;
    [[self getView] addSubview:HUD];
    [HUD showAnimated:YES];
}
-(void)showSaving
{
    MBProgressHUD *HUD=[[MBProgressHUD alloc]initWithView:[self getView]];
    HUD.backgroundView.color = [UIColor colorWithWhite:0.f alpha:.2f];
    HUD.bezelView.color = [UIColor blackColor];
    HUD.contentColor=[UIColor whiteColor];
    HUD.label.text=@"正在保存";
    HUD.removeFromSuperViewOnHide=YES;
    [[self getView] addSubview:HUD];
    [HUD showAnimated:YES];
}
-(void)hideHUD
{
    [MBProgressHUD hideHUDForView:[self getView] animated:YES];
}
-(UIView *)getView
{
    UIView *view;
    if (self.navigationController.view) {
        view=self.navigationController.view;
    }else
    {
        view=self.view;
    }
    return view;
}
@end

使用的时候直接[self showMessage:@"输入你想要的弹框内容" afterDelay:1.0];就OK了