- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
//if (self.editing)
// return UITableViewCellEditingStyleDelete;
return UITableViewCellEditingStyleNone;
}
+ (UIImage *)buildImageAndDrawText:(NSString *)text size:(CGSize)size ios7:(BOOL)iOS7SDK
{
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBFillColor(context, 1, 1, 1, 1);
CGContextFillRect(context, CGRectMake(0, 0, size.width, size.height));
UIFont *font = [UIFont italicSystemFontOfSize:15];
UIColor *fontColor = [UIColor blueColor];
if (iOS7SDK) {
NSMutableParagraphStyle *paragrapStyle = [[NSMutableParagraphStyle alloc] init];
[paragrapStyle setLineBreakMode:NSLineBreakByWordWrapping];
[paragrapStyle setAlignment:NSTextAlignmentCenter];
[text drawInRect:CGRectIntegral(CGRectMake(0, size.height/2, size.width, size.height))
withAttributes:@{
NSParagraphStyleAttributeName: paragrapStyle,
NSFontAttributeName: font,
NSForegroundColorAttributeName: fontColor}
];
} else {
[fontColor set];
[text drawInRect:CGRectIntegral(CGRectMake(0, size.height/2, size.width, size.height)) withFont:font lineBreakMode:NSLineBreakByWordWrapping alignment:NSTextAlignmentCenter];
}
UIImage *outImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return outImage;
}
self.imageView = [YourClass buildImageAndDrawText:@"iOS app development @ blog.changyy.org" size:CGSizeMake(300, 300) ios7:YES];
dispatch_semaphore_t waitJobDone = dispatch_semaphore_create(0);
[self callBlock:^{
// do something
dispatch_semaphore_signal(waitJobDone);
}];
dispatch_semaphore_wait(waitJobDone, DISPATCH_TIME_FOREVER);
dispatch_async( dispatch_queue_create(“job_running”, NULL), ^{
});
dispatch_async( dispatch_queue_create("job_running", NULL), ^{
// do something ...
dispatch_async(dispatch_get_main_queue(), ^{
// update ui
});
});
- (void)dealloc
{
// do something ...
[super dealloc];
}
ARC forbids explicit message send of 'dealloc'
You may implement a dealloc method if you need to manage resources other than releasing instance variables. You do not have to (indeed you cannot) release instance variables, but you may need to invoke [systemClassInstance setDelegate:nil] on system classes and other code that isn’t compiled using ARC.
Custom dealloc methods in ARC do not require a call to [super dealloc] (it actually results in a compiler error). The chaining to super is automated and enforced by the compiler.
- (void)dealloc
{
// do something ...
}
#define kTargetDataUpdate @"TargetDataUpdate"
- (void)setupOptions:(NSNotification *)event
{
NSLog(@"event:%@, object:%@", event, event.object);
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(setupOptions:) name:kTargetDataUpdate object:nil];
}
- (void)viewWillDisappear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] removeObserver:self name: kTargetDataUpdate object:nil];
[super viewWillDisappear:animated];
}
NSDictionary *info = @{@"status":@"ok"};
[[NSNotificationCenter defaultCenter] postNotificationName: kTargetDataUpdate object:info userInfo:nil];
** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'unable to dequeue a cell with identifier myCell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'
static NSString *CellIdentifier = @"myCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
static NSString *CellIdentifier = @"myCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self.tableView registerNib:[UINib nibWithNibName:@“MyCell" bundle:nil]
forCellReuseIdentifier:@“myCell”]; // "MyCell" for MyCell.xib
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// ...
if( cell.tag == 0 )
{
cell.tag = 1;
for (UIView *v in [cell.contentView subviews])
{
[v removeFromSuperview];
[cell.contentView addSubview:v];
}
}
return cell;
}