ActivityIndicator（菊花）的用法

1，在视图文件中拖拽一个 Activity Indicator View并且声明

#import <UIKit/UIKit.h>

@interface XViewController : UIViewController

@property (weak, nonatomic) IBOutlet UILabel *myLabel;
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *myActivityIndicatorView;
@end

 

2，运用 startAnimating 和stopAnimating方法控制菊花是否转动

//
//  XViewController.m
//  ssss
//
//

#import "XViewController.h"

@interface XViewController ()

@end

@implementation XViewController
@synthesize myLabel;
@synthesize myActivityIndicatorView;

-(void)myMethodName
{
    //加载此方法以后Label名为 welcome
    myLabel.text = @"welcome";
    //停止动画
    [myActivityIndicatorView stopAnimating];
    //将菊花隐藏掉
    myActivityIndicatorView.hidden = YES;
}


- (void)viewDidLoad
{
    [super viewDidLoad];
    [myActivityIndicatorView startAnimating];//加载的时候动画开始运行
    //2秒后运行名为myMethodName的方法
    [self performSelector:@selector(myMethodName) withObject:nil afterDelay:2.0f];
　　//selector（方法名）

}

- (void)viewDidUnload
{
    [self setMyLabel:nil];
    [self setMyActivityIndicatorView:nil];
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

@end