UIKit 框架之UIActivityIndicatorView

//
//  ViewController.m
//  UIActivityIndicatorView
//
//  Created by City--Online on 15/5/18.
//  Copyright (c) 2015年 XQB. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
@property(nonatomic,strong) UIActivityIndicatorView *activityIndicatorView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor=[UIColor blackColor];

    UIButton *btn=[UIButton buttonWithType:UIButtonTypeSystem];
    btn.frame=CGRectMake(100, 200, 50, 50);
    [btn setTitle:@"按钮" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
//    typedef NS_ENUM(NSInteger, UIActivityIndicatorViewStyle) {
//        UIActivityIndicatorViewStyleWhiteLarge,   //大白 齿轮较大
//        UIActivityIndicatorViewStyleWhite,        //小白 齿轮较小
//        UIActivityIndicatorViewStyleGray,         //小灰
//    };

    _activityIndicatorView=[[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    _activityIndicatorView.frame=CGRectMake(100, 100, 50, 50);
    _activityIndicatorView.center=self.view.center;
    //YES 停止动画时隐藏 NO 停止时不再转
    _activityIndicatorView.hidesWhenStopped=NO;
    _activityIndicatorView.backgroundColor=[UIColor redColor];
    //齿轮颜色
    _activityIndicatorView.color=[UIColor blueColor];
    //开始动画
    [_activityIndicatorView startAnimating];
    [self.view addSubview:_activityIndicatorView];
}
-(void)btnClick:(id)sender
{
    //停止动画
    [_activityIndicatorView stopAnimating];
}

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

@end