IOS network image loading framework (4 methods in total)

IOS network image loading framework (4 methods in total)

Framework name: UIImage + WebCache. h inherited from UIimageView

In the framework, there are four methods for loading network images: 1. normal loading 2. Thread NSThread 3.

 

# Import "ViewController. h"

# Import "UIImage + WebCache. h"

@ Interface ViewController ()

 

@ End

 

@ Implementation ViewController

 

-(Void) viewDidLoad {

[Super viewDidLoad];

 

ImageArray = [NSMutableArray array];

For (int I = 0; I <5; I ++ ){

For (int j = 0; j <6; j ++ ){

UIImageView * imageView = [[UIImageView alloc] initWithFrame: CGRectMake (j * 65 + 5, I * 64 + 10, 60, 60)];

ImageView. backgroundColor = [UIColor cyanColor];

[Self. view addSubview: imageView];

 

[ImageArray addObject: imageView];

}

 

}

 

 

UIButton * button = [UIButton buttonWithType: UIButtonTypeRoundedRect];

Button. frame = CGRectMake (160,400, 80, 30 );

 

[Button setTitle: @ "loading" forState: UIControlStateNormal];

[Button addTarget: self action: @ selector (buttonAction) forControlEvents: UIControlEventTouchUpInside];

 

[Self. view addSubview: button];

 

}

-(Void) buttonAction {

 

For (UIImageView * imageView in imageArray ){

NSString * string = @ "http://img3.douban.com/view/photo/photo/public/p2221339563.jpg ";

 

NSURL * url = [NSURL URLWithString: string];

 

[ImageView setImageWithURL: url];

}

}

UIImage + WebCache. h custom Method

 

 

# Import

 

@ Interface UIImageView (WebCache)

 

-(Void) setImageWithURL :( NSURL *) url;

@ End

Implementation of the UIImage + WebCache. m -------- Method

 

 

# Import "UIImage + WebCache. h"

 

@ Implementation UIImageView (WebCache)

 

-(Void) setImageWithURL :( NSURL *) url {

 

// Method 1: normal loading

/*

NSData * data = [NSData dataWithContentsOfURL: url];

UIImage * image = [UIImage imageWithData: data];

[Self setImage: image];

*/

 

// Method 2: Thread

// NSThread * thread = [[NSThread alloc] initWithTarget: self selector: @ selector (loadImage :) object: url];

 

// [Thread start];

 

// Method 3: queue

/* NSOperationQueue * queue = [[NSOperationQueue alloc] init];

// Operands

NSBlockOperation * op = [NSBlockOperation blockOperationWithBlock: ^ {

 

NSData * data = [NSData dataWithContentsOfURL: url];

UIImage * image = [UIImage imageWithData: data];

 

// Use the main queue column to return to the main thread

// Modify the UI on the main thread

[[NSOperationQueue mainQueue] addOperationWithBlock: ^ {

// Modify the UI

[Self setImage: image];

}];

}];

 

[Queue addOperation: op];

*/

 

// ---------------- GCD ---------------

/// 1. Create a Queue

// Dispatch_queue_t queue = dispatch_queue_create ("com. xw. gcd. queue", DISPATCH_QUEUE_CONCURRENT); // parallel queue

//

/// 2. Create the task to be executed and add it to the queue

// Dispatch_async (queue, ^ {

//

// NSData * data = [NSData dataWithContentsOfURL: url];

// UIImage * image = [UIImage imageWithData: data];

// [Self setImage: image];

//});

 

 

// Use the queue provided by the system ---

// (Two parameters)

// Parameter 1: Priority

// Parameter 2: identifier

Dispatch_queue_t globalQueue = dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0 );

 

Dispatch_async (globalQueue, ^ {

// Request data

NSData * data = [NSData dataWithContentsOfURL: url];

UIImage * image = [UIImage imageWithData: data];

 

// Display on the UI

Dispatch_async (dispatch_get_main_queue (), ^ {

// UI-related code

// It is best to refresh the UI to the main thread.

[Self setImage: image];

});

});

 

}

 

-(Void) loadImage :( NSURL *) url {

NSData * data = [NSData dataWithContentsOfURL: url];

UIImage * image = [UIImage imageWithData: data];

[Self setImage: image];

 

 

}

@ End