iOS 進度條的實現

在iOS的開發當中，經常會遇到讀取系統資源等類似的情況，如果網絡比較卡的話，用戶很可能以為這個app已經掛掉了，用戶體驗很差，老外還是很好的，提供開源的source，跟大家一塊學習下。

iOS的進度條可以分為幾類，有普通的，就像一個圈圈在那轉，有在圈圈下加文字的，有直接是純文字的，等等。。

在自己的項目中需要加入以下2個文件：MBProgressHUD.h和MBProgressHUD.m；接下來我們只需要在我們的.m文件中引用progress的頭文件即可。

對于普通的進度條，代碼如下：

- (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];
}

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

帶有文字的進度條：

- (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];
}

純文字的代碼：

- (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];
}

參考地址：https://github.com/jdg/MBProgressHUD

 來自：http://blog.csdn.net/weasleyqi/article/details/8072897