我有一个父视图，可让您查看UITableView中的帖子。在它的导航栏中，我有一个帖子按钮，按下时会显示一个UIView子类并在屏幕顶部显示它。我在UIView上有一个图片，当点按它时会显示UIImagePickerController以允许用户选择要发布到服务的图片。然后我使用base64encoding将图像转换为字符串，如果我使用NSLog进行打印输出，那么该函数内部的一切都很好。但是，当我发布并回调NSString中的base64encoding值时，我得到一个空值。似乎ARC在UIView子类中的管理方式与UIViewController中的方式不同，因为此代码适用于viewController，而不是保留在我的子视图中。代码在下面......你可以提供的任何方向都会非常感激，我已经使用了这些值的属性，但是没有让ARC保留它。
.h文件
@interface PostView: UIView
{
CGFloat animatedDistance;
CGRect originalFrame;
BOOL isShown;
RESTURLDelagate *_connection;
MBProgressHUD *HUD;
NSMutableData *_data;
NSData *imageData;
UIAlertView *noConnection, *userSetup, *userExist, *accountAlertView, *confirmed, *login;
}
@property (weak, nonatomic) IBOutlet UIButton *postButton;
@property (nonatomic, strong) IBOutlet UILabel *attachedLabel;
@property (weak, nonatomic) IBOutlet UITextView *textView;
@property (nonatomic, strong) IBOutlet UILabel *characterLimit;
@property (nonatomic, strong) IBOutlet UIImageView *attachImage;
@property (strong) NSString *encodedImage;
- (NSString *)Base64Encode:(NSData *)data;
- (IBAction)postAction:(id)sender;
- (void)show;
- (void)hide;
@end
.m文件
@implementation PostView
@synthesize attachedLabel;
@synthesize postButton;
@synthesize textView;
@synthesize characterLimit;
@synthesize attachImage;
@synthesize encodedImage;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
originalFrame = frame;
NSArray *xib = [[NSBundle mainBundle] loadNibNamed:@"PostView" owner:self options:nil];
PostView *view = [xib objectAtIndex:0];
[view setBackgroundColor:[UIColor whiteColor]];
[view setAlpha:0.7f];
attachedLabel = [[UILabel alloc] initWithFrame:CGRectMake(204, 212, 56, 21)];
attachedLabel.textColor = [UIColor blackColor];
[attachedLabel setText:@"Attached"];
[attachedLabel setHidden:YES];
attachedLabel.backgroundColor = [UIColor clearColor];
attachedLabel.font = [UIFont fontWithName:text_font_name size:12.0];
characterLimit = [[UILabel alloc] initWithFrame:CGRectMake(246, 13, 50, 21)];
[characterLimit setTextAlignment:NSTextAlignmentRight];
characterLimit.textColor = [UIColor blackColor];
characterLimit.backgroundColor = [UIColor clearColor];
characterLimit.font = [UIFont fontWithName:text_font_name size:12.0];
attachImage = [[UIImageView alloc] initWithFrame:CGRectMake(270, 208, 30, 30)];
[attachImage setImage:[UIImage imageNamed:@"attachphoto30x30.png"]];
[self.textView setDelegate:self];
[self.textView setAlpha:0.7f];
[self.textView setTextColor:[UIColor whiteColor]];
[self.textView setBackgroundColor:[UIColor clearColor]];
self.layer.cornerRadius = 10.0f;
self.layer.masksToBounds = YES;
[self addSubview:view];
[self addSubview:characterLimit];
[self addSubview:attachedLabel];
[self addSubview:attachImage];
}
return self;
}
- (IBAction)openCamera:(id)sender
{
UIImagePickerController *controller = [[UIImagePickerController alloc] init];
controller.delegate = self;
[(ShamePostViewController *)[self.superview nextResponder] presentViewController:controller animated:YES
completion:nil];
}
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
{
[picker dismissViewControllerAnimated:YES completion:nil];
UIImage *image = [info objectForKey: UIImagePickerControllerOriginalImage];
//UIImage *scale = [image scaleToSize:CGSizeMake(320.0f, 548.0f)];
imageData = [[NSData alloc] initWithData:UIImageJPEGRepresentation(image, 1)];
encodedImage = [self Base64Encode:imageData];
[attachedLabel setHidden:NO];
}
- (void)show
{
//prepare attachImage
attachImage.userInteractionEnabled = YES;
UITapGestureRecognizer *tapAttach = [[UITapGestureRecognizer alloc]
initWithTarget:self action:@selector(openCamera:)];
tapAttach.numberOfTapsRequired = 1;
[self.attachImage addGestureRecognizer:tapAttach];
isShown = YES;
self.transform = CGAffineTransformMakeScale(0.1, 0.1);
self.alpha = 0;
[UIView beginAnimations:@"showAlert" context:nil];
[self setBackgroundColor:[UIColor clearColor]];
[UIView setAnimationDelegate:self];
self.transform = CGAffineTransformMakeScale(1.1, 1.1);
self.alpha = 1;
[UIView commitAnimations];
}
- (void)hide
{
isShown = NO;
[UIView beginAnimations:@"hideAlert" context:nil];
[UIView setAnimationDelegate:self];
[[NSNotificationCenter defaultCenter] postNotificationName:@"hidePostView_Notification" object:nil];
self.transform = CGAffineTransformMakeScale(0.1, 0.1);
self.alpha = 0;
[UIView commitAnimations];
}
- (void)toggle
{
if (isShown)
{
[self hide];
} else
{
[self show];
}
}
#pragma mark Animation delegate
- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
if ([animationID isEqualToString:@"showAlert"])
{
if (finished)
{
[UIView beginAnimations:nil context:nil];
self.transform = CGAffineTransformMakeScale(1.0, 1.0);
[UIView commitAnimations];
}
} else if ([animationID isEqualToString:@"hideAlert"])
{
if (finished)
{
self.transform = CGAffineTransformMakeScale(1.0, 1.0);
self.frame = originalFrame;
}
}
}
#pragma mark BaseEncode64
- (NSString *)Base64Encode:(NSData *)data
{
//Point to start of the data and set buffer sizes
int inLength = [data length];
int outLength = ((((inLength * 4)/3)/4)*4) + (((inLength * 4)/3)%4 ? 4 : 0);
const char *inputBuffer = [data bytes];
char *outputBuffer = malloc(outLength);
outputBuffer[outLength] = 0;
//64 digit code
static char Encode[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
//start the count
int cycle = 0;
int inpos = 0;
int outpos = 0;
char temp;
//Pad the last to bytes, the outbuffer must always be a multiple of 4
outputBuffer[outLength-1] = '=';
outputBuffer[outLength-2] = '=';
while (inpos < inLength){
switch (cycle) {
case 0:
outputBuffer[outpos++] = Encode[(inputBuffer[inpos]&0xFC)>>2];
cycle = 1;
break;
case 1:
temp = (inputBuffer[inpos++]&0x03)<<4;
outputBuffer[outpos] = Encode[temp];
cycle = 2;
break;
case 2:
outputBuffer[outpos++] = Encode[temp|(inputBuffer[inpos]&0xF0)>> 4];
temp = (inputBuffer[inpos++]&0x0F)<<2;
outputBuffer[outpos] = Encode[temp];
cycle = 3;
break;
case 3:
outputBuffer[outpos++] = Encode[temp|(inputBuffer[inpos]&0xC0)>>6];
cycle = 4;
break;
case 4:
outputBuffer[outpos++] = Encode[inputBuffer[inpos++]&0x3f];
cycle = 0;
break;
default:
cycle = 0;
break;
}
}
NSString *pictemp = [NSString stringWithUTF8String:outputBuffer];
free(outputBuffer);
return pictemp;
}
#pragma Submit action for posting
- (IBAction)postAction:(id)sender
{
if ([textView.text isEqualToString:@""])
{
UIAlertView *noText = [[UIAlertView alloc] initWithTitle:@"Missing Content" message:@"You must enter a message to post before submitting." delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil, nil];
[noText show];
}else
if ([[[NSUserDefaults standardUserDefaults] valueForKey:@"auth_id"] isEqualToString:@"1"])
{
_data = [[NSMutableData alloc] init];
URLSingleton *urls = [URLSingleton sharedInstance];
REQUESTBuilderDelagate *rbd = [[REQUESTBuilderDelagate alloc] init];
NSString *blob_ind = [[NSString alloc] init];
NSLog(@"%@", encodedImage);
"STRING IS NULL HERE"
if ([encodedImage length] > 0)
{
blob_ind = @"1";
}else
blob_ind = @"0";
NSArray *keys = [[NSArray alloc] initWithObjects:@"token", @"postMsg", @"active", @"blob", nil];
NSArray *values = [[NSArray alloc] initWithObjects:[[NSUserDefaults standardUserDefaults]
valueForKey:@"session_token"], textView.text, @"1", blob_ind, nil];
[rbd createJSONRequest:keys values:values];
[rbd setPostURL:urls.postMessage];
_connection = [[RESTURLDelagate alloc] initWithRequest:rbd.getPostURL delegate:self];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[_connection setDescription:@"PVCPOSTMSG"];
HUD = [MBProgressHUD showHUDAddedTo:self animated:YES];
HUD.labelText = @"Posting...";
[HUD setConnection:_connection];
[_connection start];
[postButton setEnabled:NO];
}
else
{
login = [[UIAlertView alloc] initWithTitle:@"Authentication Required" message:@"Please login before attempting to post!" delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil, nil];
[login show];
[textView setText:@""];
[characterLimit setText:@"0/160"];
}
}
#pragma Post Image
-(void)postImage:(NSString *)shameID
{
if ([[[NSUserDefaults standardUserDefaults] valueForKey:@"auth_id"] isEqualToString:@"1"])
{
URLSingleton *urls = [URLSingleton sharedInstance];
REQUESTBuilderDelagate *rbd = [[REQUESTBuilderDelagate alloc] init];
NSArray *keys = [[NSArray alloc] initWithObjects:@"token", @"encode64", @"active", @"SID", nil];
NSArray *values = [[NSArray alloc] initWithObjects:[[NSUserDefaults standardUserDefaults]
valueForKey:@"session_token"], encodedImage, @"1", SID, nil];
[rbd createJSONRequest:keys values:values];
[rbd setPostURL:urls.imagePost];
_connection = [[RESTURLDelagate alloc] initWithRequest:rbd.getPostURL delegate:self];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[_connection setDescription:@"PVCADDIMAGE"];
HUD = [MBProgressHUD showHUDAddedTo:self animated:YES];
HUD.labelText = @"Attaching Image...";
[postButton setEnabled:NO];
[HUD setConnection:_connection];
[_connection start];
}
}
@end
答案 0 :(得分：0)
你只需要替换“encodedImage = [self Base64Encode：imageData];”使用给定的代码行，
[self setEncodedImage:[self Base64Encode:imageData]];
希望它能奏效：）
答案 1 :(得分：0)
您应该将属性更改为@property (nonatomic, strong) NSString *encodedImage;，并且应该将行encodedImage = [self Base64Encode:imageData];更改为self.encodedImage = [self Base64Encode:imageData];
修改
所以我看到了类似问题的答案（https://stackoverflow.com/a/13640603/2315974）所以我的最后一个想法是你应该移动
UIImage *image = [info objectForKey: UIImagePickerControllerOriginalImage];
//UIImage *scale = [image scaleToSize:CGSizeMake(320.0f, 548.0f)];
imageData = [[NSData alloc] initWithData:UIImageJPEGRepresentation(image, 1)];
encodedImage = [self Base64Encode:imageData];
[attachedLabel setHidden:NO];
在dismissViewControllerAnimated方法的完成块内。
答案 2 :(得分：0)
这不是一个答案，而是一个基于你的试用版，它运行正常。我在手机上的相机胶卷上添加了一个较小的图像，现在我在postAction方法中正确记录了字符串（我将log语句复制到方法的顶部，因为我没有对用户默认值做任何事情）：< / p>
我在PostView中唯一改变的是postAction方法。这是：
- (IBAction)postAction:(id)sender
{
NSLog(@"EncodedImage is :%@", encodedImage);
if ([textView.text isEqualToString:@""])
{
UIAlertView *noText = [[UIAlertView alloc] initWithTitle:@"Missing Content" message:@"You must enter a message to post before submitting." delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil, nil];
[noText show];
}else
if ([[[NSUserDefaults standardUserDefaults] valueForKey:@"auth_id"] isEqualToString:@"1"])
{
_data = [[NSMutableData alloc] init];
//URLSingleton *urls = [URLSingleton sharedInstance];
//REQUESTBuilderDelagate *rbd = [[REQUESTBuilderDelagate alloc] init];
NSString *blob_ind = [[NSString alloc] init];
NSLog(@"EncodedImage is :%@", encodedImage);
//"STRING IS NULL HERE"
if ([encodedImage length] > 0)
{
blob_ind = @"1";
}else
blob_ind = @"0";
NSArray *keys = [[NSArray alloc] initWithObjects:@"token", @"postMsg", @"active", @"blob", nil];
NSArray *values = [[NSArray alloc] initWithObjects:[[NSUserDefaults standardUserDefaults]
valueForKey:@"session_token"], textView.text, @"1", blob_ind, nil];
//[rbd createJSONRequest:keys values:values];
//[rbd setPostURL:urls.postMessage];
//_connection = [[RESTURLDelagate alloc] initWithRequest:rbd.getPostURL delegate:self];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
//[_connection setDescription:@"PVCPOSTMSG"];
//HUD = [MBProgressHUD showHUDAddedTo:self animated:YES];
//HUD.labelText = @"Posting...";
//[HUD setConnection:_connection];
//[_connection start];
[postButton setEnabled:NO];
}
else
{
login = [[UIAlertView alloc] initWithTitle:@"Authentication Required" message:@"Please login before attempting to post!" delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil, nil];
[login show];
[textView setText:@""];
[characterLimit setText:@"0/160"];
}
}
我在ViewController中使用此方法将PostView放在屏幕上：
-(IBAction)addPostView:(id)sender {
PostView *postView = [[PostView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:postView];
}
PostView的.h文件与你发布的相同，只不过我注释了几个ivars：
@interface PostView : UIView <UITextViewDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate>
{
CGFloat animatedDistance;
CGRect originalFrame;
BOOL isShown;
//RESTURLDelagate *_connection;
//MBProgressHUD *HUD;
NSMutableData *_data;
NSData *imageData;
UIAlertView *noConnection, *userSetup, *userExist, *accountAlertView, *confirmed, *login;
}
@property (weak, nonatomic) IBOutlet UIButton *postButton;
@property (nonatomic, strong) IBOutlet UILabel *attachedLabel;
@property (weak, nonatomic) IBOutlet UITextView *textView;
@property (nonatomic, strong) IBOutlet UILabel *characterLimit;
@property (nonatomic, strong) IBOutlet UIImageView *attachImage;
@property (strong) NSString *encodedImage;
- (NSString *)Base64Encode:(NSData *)data;
- (IBAction)postAction:(id)sender;
- (void)show;
- (void)hide;