【ios】IOS持久化数据
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NSString *astr = @"efg";
NSArray *Array = [NSArray arrayWithObjects:str, astr,nil];
//Save
NSArray *paths =NSSearchPathForDirectori
NSString *documentsDirectory = [paths objectAtIndex:0];
if (!documentsDirectory) {
}
NSString *appFile = [documentsDirectorystringByAppendingPathCom
[[NSArray arrayWithObjects:Array,nil] writeToFile:appFileatomically:NO];
//load
if([[NSFileManager defaultManager]fileExistsAtPath:appFile])
else
NSArray *strArray = [self.SaveDataArray objectAtIndex:0];
str = [strArray objectAtIndex:0];
astr = [strArray objectAtIndex:1];
NSString *astr = @"efg";
NSArray *Array = [NSArray arrayWithObjects:str, astr,nil];
//Save
NSString *Path =[NSSearchPathForDirectori
[NSKeyedArchiver archiveRootObject:ArraytoFile:filename];
str = @"a";
astr = @"";
//load
NSArray *arr = [NSKeyedUnarchiver unarchiveObjectWithFile:filename];
str = [arr objectAtIndex:0];
astr =
NSLog(@"str:%@",str);
NSLog(@"astr:%@",astr);
NSString *astr = @"efg";
NSArray *Array = [NSArray arrayWithObjects:str, astr,nil];
//Save
NSUserDefaults *SaveDefaults = [NSUserDefaultsstandardUserDefaults];
[SaveDefaults setObject:Array forKey:@"SaveKey"];
str = @"a";
astr = @"";
//load
Array = [SaveDefaults objectForKey:@"SaveKey"];
str = [Array objectAtIndex:0];
astr = [Array objectAtIndex:1];
NSLog(@"str:%@",str);
NSLog(@"astr:%@",astr);
{
}
-(id) readApplicationData:(NSString *)fileName
{
}
参数说明:
NSData
NSDocumentDirectory
UIImagePNGRepresentation
UIImageJPEGRepresentatio
代码:
NSLog(@”Downloading…”);// Get an image from the URL below
UIImage *image = [[UIImage alloc] initWithData:[NSDatadataWithContentsOfURL:[NSURLURLWithString:@"http://www.objectgraph.com/images/og_logo.png"]]];
NSLog(@”%f,%f”,image.size.width,image.size.height);
// Let’s save the file into Document folder.
// You can also change this to your desktop for testing. (e.g./Users/kiichi/Desktop/)
// NSString *deskTopDir = @”/Users/kiichi/Desktop”;
NSString *docDir =[NSSearchPathForDirectori
// If you go to the folder below, you will find thosepictures
NSLog(@”%@”,docDir);
NSLog(@”saving png”);
NSString *pngFilePath = [NSStringstringWithFormat:@"%@/test.png",docDir];
NSData *data1 = [NSDatadataWithData:UIImagePNGRepresentation
[data1 writeToFile:pngFilePath atomically:YES];
NSLog(@”saving jpeg”);
NSString *jpegFilePath = [NSStringstringWithFormat:@"%@/test.jpeg",docDir];
NSData *data2 = [NSDatadataWithData:UIImageJPEGRepresentatio
[data2 writeToFile:jpegFilePath atomically:YES];
NSLog(@”saving image done”);
[image release];
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