IOS---UIActivityIndicatorView

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1.在.h文件里面声明

#import <UIKit/UIKit.h>


@interface ViewController :UIViewController

{

    UIActivityIndicatorView * activityView;


}

- (IBAction)onClicked:(id)sender;



@end



2.在.m文件里面实现

#import "ViewController.h"


@interface ViewController ()


@end


@implementation ViewController



- (void)viewDidLoad {

    [superviewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    

   activityView=[[UIActivityIndicatorViewalloc] initWithFrame:CGRectMake(50,50, 30, 30)];

    [activityViewsetCenter:CGPointMake(160,140)];

    [activityViewsetActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];

    

    [self.viewaddSubview:activityView];

    [activityView startAnimating];

    

}


- (void)didReceiveMemoryWarning {

    [superdidReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}


- (IBAction)onClicked:(id)sender {

    [activityViewstopAnimating];

}

@end

     startAnimating 开启方法

     stopAnimating停止方法






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