压缩图片的处理

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3 
 4     self.view.backgroundColor = [UIColor greenColor];
 5     
 6     //图片
 7     UIImage *image = [UIImage imageNamed:@"myinformation_pic"];
 8     
 9     [self imageWithImageSimple:image scaledToSize:CGSizeMake(100, 100)];
10 }
11 
12 //压缩图片
13 
14 - (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize
15 {
16     //开启图片上下文
17     UIGraphicsBeginImageContext(newSize);
18     
19     //绘制图片
20     [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
21     
22     
23     //取得当前图片上下文
24     UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
25     
26     //关闭图片上下文
27     UIGraphicsEndPDFContext();
28     
29     return newImage;
30     
31 }