UIActivityIndicatorView活动指示器

活动指示器：UIActivityIndicatorView

用途:指示用户，程序正在运行之中

派生：UIView，可以被当成视图加载

创建：UIActivityIndicatorView *view=[[UIActivitiIndicatorView alloc]initWithFrame:CGRectMake(0,0,32,32)];

属性设置:

风格

activityIndicatorViewStyle:

UIActivityIndicatorViewStyleWhite 白色标准

UIActivityIndicatorViewStyleWhiteLarge 白色加大

UIActivitIndicatorViewStyleGrey 灰色指示器，用于白色背景

中点设置

方法 setCenter = self.view.center;将指示器仿制的视图的中间

隐藏

当指示器停止后自动隐藏：activityIndicator.hideWhenStoped=YES;默认为YES

不隐藏则设置为NO

启动:方法 startAnimating

停止：方法 stopAnimating

示例代码

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize indicatorView;
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    indicatorView =[[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(0.0, 0.0, 32, 32)];
    indicatorView.activityIndicatorViewStyle=UIActivityIndicatorViewStyleWhiteLarge;
    [indicatorView setCenter:self.view.center];
    [self.view addSubview:indicatorView];
    [indicatorView startAnimating];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end