MBProgressHUD

 1 MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];//加到self.view上并且"View must not be nil."
 2     hud.labelText = @"正在努力加载....";
 3     hud.labelColor = [UIColor grayColor];
 4     hud.color = [UIColor lightGrayColor];
 5     /*
 6      各种属性设置
 7      @synthesize animationType;
 8      @synthesize delegate;
 9      @synthesize opacity;
10      @synthesize color;
11      @synthesize labelFont;
12      @synthesize labelColor;
13      @synthesize detailsLabelFont;
14      @synthesize detailsLabelColor;
15      @synthesize indicator;
16      @synthesize xOffset;
17      @synthesize yOffset;
18      @synthesize minSize;
19      @synthesize square;
20      @synthesize margin;
21      @synthesize dimBackground;
22      @synthesize graceTime;
23      @synthesize minShowTime;
24      @synthesize graceTimer;
25      @synthesize minShowTimer;
26      @synthesize taskInProgress;
27      @synthesize removeFromSuperViewOnHide;
28      @synthesize customView;
29      @synthesize showStarted;
30      @synthesize mode;
31      @synthesize labelText;
32      @synthesize detailsLabelText;
33      @synthesize progress;
34      @synthesize size;
35      @synthesize activityIndicatorColor;
36      */

简单使用：