初始化：initFrame & initStyle
UIActivityIndicatorView * indicatorView = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(0, 0, 8, 8)];
[slider addSubview:indicatorView];
// 設(shè)置 風(fēng)格
indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
//設(shè)置菊花大小
indicatorView.transform = CGAffineTransformMakeScale(0.7, 0.7);
// indicatorView.centerX = slider.centerX;
//設(shè)置 完成后隱藏
indicatorView.hidesWhenStopped = NO;
indicatorView.center = slider.center;
//狀態(tài)欄小菊花
[[UIApplication sharedApplication]setNetworkActivityIndicatorVisible:YES];
indicatorView.backgroundColor = JKRandomColor;
//設(shè)置狀態(tài)欄有個小圖標(biāo) 跟著轉(zhuǎn)動 加載 yes顯示 no消失
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
