UIView 转化为 UIImage，将UIImage 保存到沙盒中

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1.UIView转UIImage(截屏,UIGraphicsBeginImageContextWithOptions函数的使用)

// 需要转成image的view:captureAndSaveView

UIGraphicsBeginImageContextWithOptions(captureAndSaveView.frame.size, NO, 1.0); //NO，YES 控制是否透明

[captureAndSaveView.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

// 生成后的image

http://liwpk.blog.163.com/blog/static/36326170201210615659749/

2.保存到iOS照片到沙盒

1）保存到iOS照片库需要引入QuartzCore.framework框架，具体代码如下：
.h文件
#import<QuartzCore/QuartzCore.h>
UIImageView *imageView;
@property (nonatomic, retain) IBOutlet UIImageView*imageView;
.m文件
UIGraphicsBeginImageCont

ext(imageView.bounds.size);
[imageView.layerrenderInContext:UIGraphicsGetCurrentContext()];
UIImage *temp = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(temp, nil, nil, nil);

2）保存到对应的沙盒目录中，具体代码如下：
NSArray *paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *filePath = [[paths objectAtIndex:0]stringByAppendingPathComponent:[NSStringstringWithFormat:@"sms.gif"]]; // 保存文件的名称
BOOL result =[UIImagePNGRepresentation(imageView.image)writeToFile:filePath atomically:YES]; // 保存成功会返回YES

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