问题描述
我正在开发一个应用程序,用于从数组中获取图像并在ScrollView中垂直显示.
I am developing one app in that getting images from array and display vertically in ScrollView.
当用户双击特定图像时,我希望根据该图像的标签值将该确切图像存储到plist中,并在以后需要时检索该图像.
when user double tapped on particular image i want that exact image store into plist according to tag value of that image, and retrieve that image later on when require.
我尝试了这个
// Store Data into plist.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask,
YES);
NSString *path = [NSString stringWithFormat:@"%@/myPlist.plist",
[paths objectAtIndex:0]];
// Place an image in a dictionary that will be stored as a plist
NSMutableDictionary * dictionary=[[NSMutableDictionary alloc]init];
[dictionary setObject:ImgView.tag forKey:@"image"];
NSLog(@"%@",dictionary);
// Write the dictionary to the filesystem as a plist
[NSKeyedArchiver archiveRootObject:dictionary toFile:path];
//为了从NSmutable数组中获取数据,请将其存储到滚动视图.
// For getting data from NSmutable array store it to the scrollview.
int m=0;
AppDelegate * delegate=(AppDelegate *)[[UIApplication sharedApplication]delegate];
delegate.front=TRUE;
delegate.back=FALSE;
UIScrollView *scrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
[scrollView setPagingEnabled:YES];
[scrollView setShowsHorizontalScrollIndicator:NO];
FrontsCards=[[NSMutableArray alloc]initWithObjects:@"cloub1.png",@"cloub2.png",@"cloub3.png",@"cloub4.png",@"cloub5.png",@"cloub6.png",@"cloub7.png",@"cloub8.png",@"cloub9.png",@"cloub10.png",@"cloub11.png",@"cloub12.png",@"diamond1.png",@"diamond2.png",@"diamond3.png",@"diamond4.png",@"diamond5.png", nil];
for(m=0; m<[FrontsCards count];m++)
{
ImgView.alpha=1;
ImgView.tag=m;
int randIdx=arc4random()%[FrontsCards count];
NSString *imageName=[FrontsCards objectAtIndex:randIdx];
NSString *fullImageName=[NSString stringWithFormat:@"%@",imageName];
int padding=0;
CGRect imageViewFrame=CGRectMake(scrollView.frame.size.width*m+padding, scrollView.frame.origin.y, scrollView.frame.size.width-2*padding, scrollView.frame.size.height);
ImgView=[[UIImageView alloc]initWithFrame:imageViewFrame];
[ImgView setImage:[UIImage imageNamed:fullImageName]];
NSLog(@"%d",m);
// Place an image in a dictionary that will be stored as a plist
//[dictionary setObject:image forKey:@"image"];
// Write the dictionary to the filesystem as a plist
//[NSKeyedArchiver archiveRootObject:dictionary toFile:path];
[scrollView addSubview:ImgView];
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapImgView:)];
doubleTap.numberOfTapsRequired = 2;
doubleTap.delegate = self;
[self.ImgView addGestureRecognizer:doubleTap];
self.ImgView.userInteractionEnabled=YES;
}
CGSize scrollViewSize=CGSizeMake(scrollView.frame.size.width*[FrontsCards count], scrollView.frame.size.height);
[scrollView setContentSize:scrollViewSize];
[self.view addSubview:scrollView];
提前帮助我.
推荐答案
在.m文件顶部定义此MACRO定义
Define this MACRO Definition at the top of your .m file
#define LIB_DIR_PATH NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)[0]
使用此功能可将图像保存到带有图像和名称的列表中
Use this function to Save Image to Plist with Image and Name
- (void)saveImage:(UIImage *)image WithName:(NSString *)imageName
{
// If File Exist then read it otherwise creat new
NSMutableDictionary *imageInfoDict;
if([[NSFileManager defaultManager] fileExistsAtPath:[LIB_DIR_PATH stringByAppendingPathComponent:@"imageInfo.plist"]])
{
NSData *fileData = [NSData dataWithContentsOfFile:[LIB_DIR_PATH stringByAppendingPathComponent:@"imageInfo.plist"]];
imageInfoDict = [NSMutableDictionary dictionaryWithDictionary:[NSKeyedUnarchiver unarchiveObjectWithData:fileData]];
}
else
imageInfoDict = [NSMutableDictionary dictionaryWithCapacity:0];
// Add Single Image to Dictionary
[imageInfoDict setValue:image forKey:imageName];
// Convert Main info Dictionary to `NSData` to Save on Disc
[NSKeyedArchiver archiveRootObject:imageInfoDict toFile:[LIB_DIR_PATH stringByAppendingPathComponent:@"imageInfo.plist"]];
// To Read Stored Image Use Following Code
[self readImageFromPlistByKey:imageName];
}
此函数从Plist返回相应名称的图像
This function returns image for respective name from Plist
-(UIImage *)readImageFromPlistByKey:(NSString *)keyName
{
// If File Exist then read it otherwise creat new
NSMutableDictionary *imageInfoDict;
if([[NSFileManager defaultManager] fileExistsAtPath:[LIB_DIR_PATH stringByAppendingPathComponent:@"imageInfo.plist"]])
{
NSData *fileData = [NSData dataWithContentsOfFile:[LIB_DIR_PATH stringByAppendingPathComponent:@"imageInfo.plist"]];
if([fileData length] > 0)
{
// Read Plist
imageInfoDict = [NSMutableDictionary dictionaryWithDictionary:[NSKeyedUnarchiver unarchiveObjectWithData:fileData]];
// Here is your Image
return imageInfoDict[keyName];
}
}
else
{
// Return Default Image if not Found
return [UIImage imageNamed:@"Default.png"];
}
}
这篇关于从plist保存并获取图像的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!