ARC下采用的第三方库网络下载 …
需要借助第三方库AFNetworking
#import "ViewController.h"
#import "AFNetworking.h"
@interface ViewController (){
UIImageView* _imageView;
UIProgressView* _pv;
AFImageRequestOperation* _operation;
}
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
//断点续传 请求队列
//[self httpRequest];
//[self jsonRequest];
//[self imageRequest];
//[self client];
[self makeView];
}
- (void)makeView{
_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 20, 320, 240)];
[self.view addSubview:_imageView];
_pv = [[UIProgressView alloc] initWithFrame:CGRectMake(50, 300, 220, 20)];
[self.view addSubview:_pv];
NSArray* array = @[@"开始", @"暂停", @"继续"];
for (int i = 0; i < 3; i++) {
UIButton* button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(20 + 100 * i, 350, 80, 20);
[button setTitle:array[i] forState:UIControlStateNormal];
button.tag = i;
[button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
//请求
NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://img0.bdstatic.com/img/image/shouye/mxtfboy-13712786966.jpg"]];
_operation = [[AFImageRequestOperation alloc] initWithRequest:request];
//指定下载目录
NSString* path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/a.jpg"];
NSLog(@"%@", path);
NSURL* url = [NSURL fileURLWithPath:path];
_operation.outputStream = [NSOutputStream outputStreamWithURL:url append:NO];
//回调
[_operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"下载完成");
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"请求失败");
}];
//进度条
__weak UIProgressView* pv = _pv;
[_operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
[pv setProgress:(float)totalBytesRead/totalBytesExpectedToRead animated:YES];
}];
}
- (void)buttonClick:(UIButton*)button{
//开始
if (button.tag == 0) {
[_operation start];
}
//暂停
if (button.tag == 1) {
[_operation pause];
}
//继续
if (button.tag == 2) {
[_operation resume];
}
}
- (void)client{
AFHTTPClient* client = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"http://10.0.8.8/sns/"]];
//发起一个get请求
[client getPath:@"my/user_list.php?page=1" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"请求失败");
}];
//发起一个post请求
[client postPath:@"my/user_list.php" parameters:@{@"page":@"1"} success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSString* str = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
NSLog(@"%@", str);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"请求失败");
}];
}
- (void)imageRequest{
NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com/img/bdlogo.png"]];
AFImageRequestOperation* operation = [[AFImageRequestOperation alloc] initWithRequest:request];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
self.view.backgroundColor = [UIColor colorWithPatternImage:responseObject];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"请求失败");
}];
[operation start];
}
- (void)jsonRequest{
NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://api.douban.com/v2/book/search?q=harry&start=0&apikey=08e5e8516f3402a71ab1b8f44d9c07f5"]];
AFJSONRequestOperation* operation = [[AFJSONRequestOperation alloc] initWithRequest:request];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
NSNumber* num = [responseObject objectForKey:@"count"];
NSLog(@"%@", num);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"请求失败");
}];
[operation start];
}
- (void)httpRequest{
NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://10.0.8.8/sns/my/user_list.php"]];
AFHTTPRequestOperation* operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
//设置回调block
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
NSString* str = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
NSLog(@"%@", str);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"请求失败");
}];
//开始
[operation start];
}
@end