//联系人:石虎QQ: 1224614774昵称:嗡嘛呢叭咪哄
//
//下载图片
// Created by石虎on 17/6/18.
// Copyright © 2017年石虎. All rights reserved.
//
#import"ViewController.h"
/**
注意:1.只需要把以下代码拷贝到项目就可以用
2.如果需要换图片,把宏定义的URL地址换了即可
*/
//创建图片地址
#define URL @"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1497842327410&di=ac2a6e0a6bd2dcc7330f234393a4ea8e&imgtype=0&src=http%3A%2F%2Fscimg.jb51.net%2Fallimg%2F160106%2F14-160106152915B2.jpg"
@interfaceViewController()
//显示的图片
@property(strong,nonatomic)UIImageView*imageView;
//点击下载图片按钮
@property(strong,nonatomic)UIButton*downloadBtn;
@end
@implementationViewController
- (void)viewDidLoad
{
[superviewDidLoad];
//1.创建图片控件
_imageView =[[UIImageView alloc]initWithFrame:CGRectMake(30,20,self.view.frame.size.width-60,450)];
//图片背景颜色
_imageView.backgroundColor=[UIColor lightGrayColor];
//把图片添加到视图View上面
[self.view addSubview:_imageView];
//2.创建下载图片按钮
_downloadBtn=[[UIButton alloc]initWithFrame:CGRectMake(100,500,120,30)];
//按钮上面添加文字
[_downloadBtn setTitle:@"点击下载图片"forState:UIControlStateNormal];
//字体颜色
[_downloadBtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
//字体背景
_downloadBtn.backgroundColor=[UIColor lightGrayColor];
//按钮点击事件
[_downloadBtn addTarget:selfaction:@selector(imageClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_downloadBtn];
}
-(void)imageClick
{
NSLog(@"--->>图片按钮被点击了！！！");
_downloadBtn.backgroundColor=[UIColor redColor];
[_downloadBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
//根据字符串生成url对象
NSURL *url=[NSURL URLWithString:URL];
//创建多线程
NSThread *thread =[[NSThread alloc]initWithTarget:selfselector:@selector(downLodImage:) object:url];
//开启线程
[thread start];
}
-(void)downLodImage:(NSURL*)url
{
//根据url获取图片的二进制数据
NSData *data=[NSData dataWithContentsOfURL:url];
UIImage *imageView2=[UIImage imageWithData:data];
[selfperformSelectorOnMainThread:@selector(imageRefresh:) withObject:imageView2 waitUntilDone:NO];
}
//刷新主线程
-(void)imageRefresh:(UIImage*)image
{
//全局图片
_imageView.image=image;
}
@end
