需要借助第三方库AFNetworking
#import "ViewController.h"
#import "AFNetworking.h"
@interface ViewController(){
UIImageView* _imageView;
UIProgressView* _pv;
AFImageRequestOperation* _operation;
}
@end
@implementationViewController
- (void)viewDidLoad
{
[superviewDidLoad];
//断点续传 请求队列
//[self httpRequest];
//[self jsonRequest];
//[self imageRequest];
//[self client];
[self makeView];
}
- (void)makeView{
_imageView =[[UIImageViewalloc]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 = [UIButtonbuttonWithType:UIButtonTypeRoundedRect];
button.frame= CGRectMake(20 + 100 * i, 350, 80, 20);
[buttonsetTitle:array[i]forState:UIControlStateNormal];
button.tag =i;
[buttonaddTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
//请求
NSURLRequest*request = [NSURLRequestrequestWithURL:[NSURLURLWithString:@"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 =[NSOutputStreamoutputStreamWithURL:urlappend: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/totalBytesExpectedToReadanimated:YES];
}];
}
- (void)buttonClick:(UIButton*)button{
//开始
if (button.tag == 0) {
[_operationstart];
}
//暂停
if (button.tag == 1) {
[_operationpause];
}
//继续
if (button.tag == 2) {
[_operationresume];
}
}
- (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= [[NSStringalloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
NSLog(@"%@", str);
} failure:^(AFHTTPRequestOperation *operation,NSError *error) {
NSLog(@"请求失败");
}];
}
- (void)imageRequest{
NSURLRequest*request = [NSURLRequestrequestWithURL:[NSURLURLWithString:@"http://www.baidu.com/img/bdlogo.png"]];
AFImageRequestOperation* operation = [[AFImageRequestOperationalloc] 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 = [NSURLRequestrequestWithURL:[NSURLURLWithString:@"https://api.douban.com/v2/book/search?q=harry&start=0&apikey=08e5e8516f3402a71ab1b8f44d9c07f5"]];
AFJSONRequestOperation* operation = [[AFJSONRequestOperationalloc] 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 = [NSURLRequestrequestWithURL:[NSURLURLWithString:@"http://10.0.8.8/sns/my/user_list.php"]];
AFHTTPRequestOperation* operation = [[AFHTTPRequestOperationalloc] initWithRequest:request];
//设置回调block
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation*operation, id responseObject){
NSString* str= [[NSStringalloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
NSLog(@"%@", str);
} failure:^(AFHTTPRequestOperation *operation,NSError *error) {
NSLog(@"请求失败");
}];
//开始
[operation start];
}
@end
