添加了两个更好理解NSRunloop的网络连接例子（易学易懂）

.gitignore

@@ -0,0 +1,33 @@
+#Created by http://www.gitignore.io
+
+### Xcode ###
+build
+*.xcodeproj/*
+!*.xcodeproj/project.pbxproj
+!*.xcworkspace/contents.xcworkspacedata
+
+
+### Objective-C ###
+# OS X
+.DS_Store
+
+# Xcode
+build/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
+*.xccheckout
+profile
+*.moved-aside
+DerivedData
+*.hmap
+*.ipa
+
+# CocoaPods
+Pods

NSURLConnectionExample/NSURLConnectionExample.xcodeproj/project.pbxproj

@@ -7,6 +7,8 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		45914ED418D81C5700C9B9C0 /* WTThreadDownloader.m in Sources */ = {isa = PBXBuildFile; fileRef = 45914ED318D81C5700C9B9C0 /* WTThreadDownloader.m */; };
+		45914ED718D8230200C9B9C0 /* WTOperationDownloader.m in Sources */ = {isa = PBXBuildFile; fileRef = 45914ED618D8230200C9B9C0 /* WTOperationDownloader.m */; };
 		ADB86C77177F613700E9AEC6 /* PTOperationDownloader.m in Sources */ = {isa = PBXBuildFile; fileRef = ADB86C76177F612B00E9AEC6 /* PTOperationDownloader.m */; };
 		F40E9FEB177A8E7900692CB2 /* PTThreadDownloader.m in Sources */ = {isa = PBXBuildFile; fileRef = F40E9FE8177A8E5800692CB2 /* PTThreadDownloader.m */; };
 		F40E9FEC177A8E7900692CB2 /* PTNormalDownloaler.m in Sources */ = {isa = PBXBuildFile; fileRef = F40E9FEA177A8E6E00692CB2 /* PTNormalDownloaler.m */; };
@@ -37,6 +39,10 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		45914ED218D81C5700C9B9C0 /* WTThreadDownloader.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WTThreadDownloader.h; sourceTree = "<group>"; };
+		45914ED318D81C5700C9B9C0 /* WTThreadDownloader.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = WTThreadDownloader.m; sourceTree = "<group>"; };
+		45914ED518D8230200C9B9C0 /* WTOperationDownloader.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WTOperationDownloader.h; sourceTree = "<group>"; };
+		45914ED618D8230200C9B9C0 /* WTOperationDownloader.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = WTOperationDownloader.m; sourceTree = "<group>"; };
 		ADB86C75177F612B00E9AEC6 /* PTOperationDownloader.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = PTOperationDownloader.h; sourceTree = "<group>"; };
 		ADB86C76177F612B00E9AEC6 /* PTOperationDownloader.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = PTOperationDownloader.m; sourceTree = "<group>"; };
 		F40E9FE7177A8E5800692CB2 /* PTThreadDownloader.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = PTThreadDownloader.h; sourceTree = "<group>"; };
@@ -132,6 +138,10 @@
 				F40E9FE8177A8E5800692CB2 /* PTThreadDownloader.m */,
 				ADB86C75177F612B00E9AEC6 /* PTOperationDownloader.h */,
 				ADB86C76177F612B00E9AEC6 /* PTOperationDownloader.m */,
+				45914ED218D81C5700C9B9C0 /* WTThreadDownloader.h */,
+				45914ED318D81C5700C9B9C0 /* WTThreadDownloader.m */,
+				45914ED518D8230200C9B9C0 /* WTOperationDownloader.h */,
+				45914ED618D8230200C9B9C0 /* WTOperationDownloader.m */,
 				F44D2A5C17798A5C00B48C77 /* Images.xcassets */,
 				F44D2A4B17798A5C00B48C77 /* Supporting Files */,
 			);
@@ -268,7 +278,9 @@
 				ADB86C77177F613700E9AEC6 /* PTOperationDownloader.m in Sources */,
 				F40E9FEB177A8E7900692CB2 /* PTThreadDownloader.m in Sources */,
 				F40E9FEC177A8E7900692CB2 /* PTNormalDownloaler.m in Sources */,
+				45914ED418D81C5700C9B9C0 /* WTThreadDownloader.m in Sources */,
 				F44D2A5517798A5C00B48C77 /* PTAppDelegate.m in Sources */,
+				45914ED718D8230200C9B9C0 /* WTOperationDownloader.m in Sources */,
 				F44D2A5B17798A5C00B48C77 /* PTViewController.m in Sources */,
 				F44D2A5117798A5C00B48C77 /* main.m in Sources */,
 			);

NSURLConnectionExample/NSURLConnectionExample/Images.xcassets/AppIcon.appiconset/Contents.json

@@ -5,6 +5,11 @@
       "size" : "29x29",
       "scale" : "2x"
     },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
     {
       "idiom" : "iphone",
       "size" : "60x60",

NSURLConnectionExample/NSURLConnectionExample/PTViewController.m

@@ -10,6 +10,8 @@
 #import "PTNormalDownloaler.h"
 #import "PTThreadDownloader.h"
 #import "PTOperationDownloader.h"
+#import "WTThreadDownloader.h"
+#import "WTOperationDownloader.h"
 
 @interface PTViewController ()
 
@@ -21,9 +23,13 @@ - (void)viewDidLoad
 {
     [super viewDidLoad];
     UIButton *button = [UIButton buttonWithType:UIButtonTypeContactAdd];
-    button.frame = CGRectMake(100, 100, 100, 30);
+    button.frame = CGRectMake(100, 30, 100, 30);
     [button addTarget:self action:@selector(toggleButton) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:button];
+
+    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 60, 320, 400)];
+    imageView.tag = 123456;
+    [self.view addSubview:imageView];
 }
 
 - (void)didReceiveMemoryWarning
@@ -49,16 +55,16 @@ - (void)toggleButton
 //                                              }];
 
     //Use PTThreadDownloaler
-    PTThreadDownloader *downloader = [PTThreadDownloader
-                                      downloadWithURL:[NSURL URLWithString:URLString]
-                                      timeoutInterval:15
-                                      success:^(id responseData){
-                                          NSLog(@"get data size: %d", [(NSData *)responseData length]);
-                                          NSLog(@"success block in main thread?: %d", [NSThread isMainThread]);
-                                      }
-                                      failure:^(NSError *error){
-                                          NSLog(@"failure block in main thread?: %d", [NSThread isMainThread]);
-                                      }];
+//    PTThreadDownloader *downloader = [PTThreadDownloader
+//                                      downloadWithURL:[NSURL URLWithString:URLString]
+//                                      timeoutInterval:15
+//                                      success:^(id responseData){
+//                                          NSLog(@"get data size: %d", [(NSData *)responseData length]);
+//                                          NSLog(@"success block in main thread?: %d", [NSThread isMainThread]);
+//                                      }
+//                                      failure:^(NSError *error){
+//                                          NSLog(@"failure block in main thread?: %d", [NSThread isMainThread]);
+//                                      }];
 
 
     //Use PTOperationDownloader
@@ -76,7 +82,35 @@ - (void)toggleButton
 //    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
 //    [queue addOperation:downloader];NSBlockOperation
 
+    //Use WTThreadDownloader
+//    WTThreadDownloader *downloader = [WTThreadDownloader downloadWithURL:[NSURL URLWithString:URLString] timeoutInterval:15 success:^(id responseData)
+//    {
+//        dispatch_async(dispatch_get_main_queue(), ^
+//        {
+//            UIImageView *imageView = (UIImageView *)[self.view viewWithTag:123456];
+//            UIImage *image = [UIImage imageWithData:(NSData *)responseData];
+//            imageView.image = image;
+//        });
+//    }
+//    failure:^(NSError *error)
+//    {
+//        NSLog(@"Failed WTThreadDownloader: %@",error);
+//    }];
+
+    //Use WTOperationDownloader
+    WTOperationDownloader *downloader = [WTOperationDownloader downloadWithURL:[NSURL URLWithString:URLString] timeoutInterval:15 success:^(id responseData)
+    {
+        UIImageView *imageView = (UIImageView *)[self.view viewWithTag:123456];
+        UIImage *image = [UIImage imageWithData:(NSData *)responseData];
+        imageView.image = image;
+    }
+    failure:^(NSError *error)
+    {
+        NSLog(@"Failed WTThreadDownloader: %@",error);
+    }];
+    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
+    [queue addOperation:downloader];
+
     NSLog(@"started downloader: %@", downloader.URL.absoluteString);
 }
-
 @end

NSURLConnectionExample/NSURLConnectionExample/WTOperationDownloader.h

@@ -0,0 +1,22 @@
+//
+//  WTOperationDownloader.h
+//  NSURLConnectionExample
+//
+//  Created by Joywii on 14-3-18.
+//  Copyright (c) 2014年 KiloApp. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+typedef void (^completionBlock)();
+
+@interface WTOperationDownloader : NSOperation
+
+@property (nonatomic, readwrite, retain) NSURL *URL;
+
++ (id)downloadWithURL:(NSURL *)URL
+      timeoutInterval:(NSTimeInterval)timeoutInterval
+              success:(void (^)(id responseData))success
+              failure:(void (^)(NSError *error))failure;
+
+@end