IOS 内存警告 Memory warning level

//
//  SvMemoryWarningViewController.m
//  SvMemoryWarning
//
//  Created by maple on 3/9/12.
//  Copyright (c) 2012 SmileEvday. All rights reserved.
//

#import "SvMemoryWarningViewController.h"
#import <libkern/OSMemoryNotification.h>
#import "SvLeakMemoryView.h"

@interface SvMemoryWarningViewController ()

@end

@implementation SvMemoryWarningViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
    
    SvLeakMemoryView *view = [[SvLeakMemoryView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    [self.view addSubview:view];
    [view release];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
// Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return interfaceOrientation == UIInterfaceOrientationPortrait;
}

- (void)didReceiveMemoryWarning
{

    NSLog(@"Recieve memory warning");
    NSLog(@"~~~~~~~~~~~~~~level~~~~~~~~~~~~~~~ %d", (int)OSMemoryNotificationCurrentLevel());
}

@end

#import "SvLeakMemoryView.h"
#import <QuartzCore/QuartzCore.h>

@implementation SvLeakMemoryView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
if (self) {
// Initialization code
        
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:frame];

        NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Car" ofType:@"jpg"];
        imageView.image = [[UIImage alloc] initWithContentsOfFile:filePath];

        imageView.layer.contentsGravity = kCAGravityResizeAspect;
        [self addSubview:imageView];

        NSString *filePath2 = [[NSBundle mainBundle] pathForResource:@"treeHighResolution" ofType:@"jpg"]; 
        dispatch_queue_t loadImageQueue = dispatch_queue_create("load image", NULL);

        __block UIImageView *testIV = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
        dispatch_async(loadImageQueue, ^{
while (TRUE) {
                UIImage *image = [[UIImage alloc] initWithContentsOfFile:filePath2];
                testIV.image = image;
            }
        });
    }
return self;
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

@end