iOS 进度条的实现

在iOS的开发当中，经常会遇到读取系统资源等类似的情况，如果网络比较卡的话，用户很可能以为这个app已经挂掉了，用户体验很差，老外还是很好的，提供开源的source，跟大家一块学习下。

iOS的进度条可以分为几类，有普通的，就像一个圈圈在那转，有在圈圈下加文字的，有直接是纯文字的，等等。。

在自己的项目中需要加入以下2个文件：MBProgressHUD.h和MBProgressHUD.m；接下来我们只需要在我们的.m文件中引用progress的头文件即可。

对于普通的进度条，代码如下：

 

- (IBAction)showSimple:(id)sender {
    // The hud will dispable all input on the view (use the higest view possible in the view hierarchy)
    HUD = [[MBProgressHUD alloc] initWithView:self.navigationController.view];
    [self.navigationController.view addSubview:HUD];

    // Regiser for HUD callbacks so we can remove it from the window at the right time
    HUD.delegate = self;

    // Show the HUD while the provided method executes in a new thread
    [HUD showWhileExecuting:@selector(myTask) onTarget:self withObject:nil animated:YES];
}

选择器函数myTask中可以做我们想要做的事情：

- (void)myTask {
    // Do something usefull in here instead of sleeping ...
    sleep(3);
}

 

带有文字的进度条：

- (IBAction)showWithLabel:(id)sender {

    HUD = [[MBProgressHUD alloc] initWithView:self.navigationController.view];
    [self.navigationController.view addSubview:HUD];

    HUD.delegate = self;
    HUD.labelText = @"Loading";

    [HUD showWhileExecuting:@selector(myTask) onTarget:self withObject:nil animated:YES];
}

纯文字的代码：

- (IBAction)showTextOnly:(id)sender {

    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES];

    // Configure for text only and offset down
    hud.mode = MBProgressHUDModeText;
    hud.labelText = @"Some message...";
    hud.margin = 10.f;
    hud.yOffset = 150.f;
    hud.removeFromSuperViewOnHide = YES;

    [hud hide:YES afterDelay:3];
}