iOS控件之UIActivityIndicatorView

UIActivityIndicatorView就是我们 常说的“风火轮”视图

作用：提示用户当前页面正在加载数据

常用属性和方法：

// 设置风格

@property(nonatomic) UIActivityIndicatorViewStyle activityIndicatorViewStyle;

// 停止时，隐藏视图，默认为YES

@property(nonatomic) BOOL  hidesWhenStopped;

// 修改颜色，注意版本问题

@property (readwrite, nonatomic, retain) UIColor *color

// 开始动画

- (void)startAnimating;

// 停止动画

- (void)stopAnimating;

// 判断动画的状态（停止或开始）

- (BOOL)isAnimating;

project: ActivityViewDemo

打开 AppDelegate.m

在  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

中的    [self.window makeKeyAndVisible];  顶上加入

UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

activityView.center = CGPointMake(160, 200);

[activityView startAnimating];

//    activityView.hidesWhenStopped = NO;

[self.window addSubview:activityView];

[NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(test:) userInfo:activityView repeats:NO];

//状态栏中的网络图标

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];

加入方法

- (void)test:(NSTimer *)timer

{

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];

UIActivityIndicatorView *activityView = [timer userInfo];

[activityView stopAnimating];

}

运行    风火轮 3秒钟都不转了