状态栏显示网络加载进度

[v5tech]

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

或者使用宏，定义如下：

#define ShowNetworkActivityIndicator() [UIApplication sharedApplication].networkActivityIndicatorVisible = YES
#define HideNetworkActivityIndicator() [UIApplication sharedApplication].networkActivityIndicatorVisible = NO

使用下面的代码来调用

ShowNetworkActivityIndicator(); //加载进度可见
HideNetworkActivityIndicator();//加载进度不可见