IOS nsoperation Asynchronous Load Picture Encapsulation Nsoperation Agent Update

#import <Foundation/Foundation.h>

@class myoperation;

@protocol myoperationdelecate <NSObject>

-(void) Operationwithstr: (uiimage*) str;

@end

@interface myoperation:nsoperation

@property (nonatomic,copy) NSString *imageurl;

@property (Nonatomic,weak) id<myoperationdelecate>delegate;

@end

#import "MYOperation.h"

@implementation Myoperation

The main method must be implemented

-(void) Main

{

@autoreleasepool {

Simulates downloading a picture the returned string is returned to the controller in the main process to be followed by the new operation

Uiimage*str=[self Downloadimage];

[[Nsoperationqueue mainqueue]addoperationwithblock:^{

if ([Self.delegate respondstoselector: @selector (operationwithstr:)])

{

[Self.delegate OPERATIONWITHSTR:STR];

}

}];

};

}

Simulate download pictures

-(uiimage*) downloadimage

{

Nsurl *url=[nsurl urlwithstring: Self.imageurl];

NSData *data=[nsdata Datawithcontentsofurl:url];

Uiimage*image=[uiimage Imagewithdata:data];     

return image;

}

@end

Controller Load Code

#import "ViewController.h"

#import "MYOperation.h"

@interface Viewcontroller () <MYOperationDelecate>

@property (Nonatomic,strong) nsoperationqueue*operation;

@end

@implementation Viewcontroller

-(void) Viewdidload {

[Super Viewdidload];

Additional setup after loading the view, typically from a nib.

}

-(void) Touchesbegan: (Nsset *) touches withevent: (Uievent *) event

{

Myoperation *operation=[[myoperation Alloc]init];

operation.delegate=self;

Operation. [Email protected] "www.baidu.com/image";

[Self.operation addoperation:operation];

}

-(void) Operationwithstr: (uiimage*) str

{

#warning here to implement updates to the UI interface

NSLog (@ "%@,%@", Str,[nsthread CurrentThread]);

}

-(Nsoperationqueue *) operation

{

if (!_operation)

{

_operation=[[nsoperationqueue Alloc]init];

[_operation Setmaxconcurrentoperationcount:6];

}

return _operation;

}

@end

IOS nsoperation loading picture nsoperation agent updates asynchronously