问题
I am creating custom UITableViewCell before starting to create it i read many articles about it and I start to create my own CustomTableViewCell.
In my custom TableViewCell I have 4 filds:
- UILabel* cellTitle
- UILabel* cellDateTime
- UIView* cellMainImage
- UIImageView* arraow image
Here is how is my TableViewCell appear:
And here is the code: of CustomTableViewCell.h
#import <UIKit/UIKit.h>
#define TAGS_TITLE_SIZE 20.0f
#define TITLE_LABEL_TAG 1
#define DATA_TIME_LABEL_TAG 5
#define ARROW_IMAGE_TAG 6
#define MAIN_IMAGE_TAG 7
// Enumeration for initiakization TableView Cells
typedef enum {
NONE_TABLE_CELL = 0,
NEWS_FEED_TABLE_CELL = 1,
TAGS_TABLE_CELL = 2
}TableTypeEnumeration;
// Class for Custom Table View Cell.
@interface CustomTableViewCell : UITableViewCell {
// Title of the cell.
UILabel* cellTitle;
UILabel* cellDataTime;
UIView* cellMainImage;
UIImageView* cellArrowImage;
}
// Set the title of the cell.
- (void) SetCellTitle: (NSString*) _cellTitle;
- (void) SetCellDateTime: (NSString*) _cellDataTime;
- (void) ReleaseCellMainImage;
- (void) InitCellTitleLable;
- (void) InitCellDateTimeLabel;
- (void) InitCellMainImage;
// Init With Style (With additional parametr TableTypeEnumeration)
- (id)initWithStyle: (UITableViewCellStyle)style reuseIdentifier: (NSString *)reuseIdentifier tableType:(TableTypeEnumeration)tabletypeEnum;
@end
And here is the code of: CustomTableViewCell.m
#import "CustomTableViewCell.h"
@implementation CustomTableViewCell
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
return [self initWithStyle:style reuseIdentifier:reuseIdentifier tableType:NONE_TABLE_CELL];
}
- (id)initWithStyle: (UITableViewCellStyle)style reuseIdentifier: (NSString *)reuseIdentifier tableType:(TableTypeEnumeration)tabletypeEnum {
// Get Self.
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Switch table View Cells
switch(tabletypeEnum) {
case NEWS_FEED_TABLE_CELL: {
// Create Cell Title Text
cellTitle = [[UILabel alloc] initWithFrame:CGRectMake(75.0f, 2.5f, 180.0f, 33.0f)];
cellTitle.tag = TITLE_LABEL_TAG;
cellTitle.font = [UIFont boldSystemFontOfSize: 13.0f];
cellTitle.lineBreakMode = UILineBreakModeWordWrap;
cellTitle.numberOfLines = 0;
cellTitle.textAlignment = UITextAlignmentLeft;
cellTitle.textColor = [UIColor blackColor];
[self.contentView addSubview:cellTitle];
[cellTitle release];
// Create Cell Description Text.
cellDataTime = [[UILabel alloc] initWithFrame:CGRectMake(135.0f, 38.0f, 100.0f, 15.0f)];
cellDataTime.tag = DATA_TIME_LABEL_TAG;
cellDataTime.font = [UIFont italicSystemFontOfSize: 12.0f];
cellDataTime.textAlignment = UITextAlignmentLeft;
cellDataTime.textColor = [UIColor blackColor];
cellDataTime.lineBreakMode = UILineBreakModeWordWrap;
[self.contentView addSubview:cellDataTime];
[cellDataTime release];
// Create Cell Arrow Image.
cellArrowImage = [[UIImageView alloc] initWithFrame:CGRectMake(260.0f, 7.0f, 40.0f, 49.0f)];
cellArrowImage.tag = ARROW_IMAGE_TAG;
cellArrowImage.backgroundColor = [UIColor whiteColor];
cellArrowImage.image = [UIImage imageNamed:@"Grey Arrow.png"];;
[self.contentView addSubview:cellArrowImage];
[cellArrowImage release];
// Create Cell Main Image.
cellMainImage = [[[UIView alloc] initWithFrame:CGRectMake(2.0f, 2.5f, 55.0f, 50.0f)] autorelease];
cellMainImage.tag = MAIN_IMAGE_TAG;
[self.contentView addSubview:cellMainImage];
break;
}
case TAGS_TABLE_CELL: {
// Create and initialize Title of Custom Cell.
cellTitle = [[UILabel alloc] initWithFrame:CGRectMake(10, (44 - TAGS_TITLE_SIZE)/2, 260, 21)];
cellTitle.backgroundColor = [UIColor clearColor];
cellTitle.opaque = NO;
cellTitle.textColor = [UIColor blackColor];
cellTitle.highlightedTextColor = [UIColor whiteColor];
cellTitle.font = [UIFont boldSystemFontOfSize:TAGS_TITLE_SIZE];
cellTitle.textAlignment = UITextAlignmentLeft;
[self.contentView addSubview:cellTitle];
[cellTitle release];
break;
}
default: break;
}
}
return self;
}
- (void) ReleaseCellMainImage {
[cellMainImage release];
}
- (void) InitCellTitleLable {
cellTitle = (UILabel *)[self.contentView viewWithTag:TITLE_LABEL_TAG];
}
- (void) InitCellDateTimeLabel {
cellDataTime = (UILabel *)[self.contentView viewWithTag:DATA_TIME_LABEL_TAG];
}
- (void) InitCellMainImage {
//UIView* oldImage = [self.contentView viewWithTag:MAIN_IMAGE_TAG];
//[oldImage removeFromSuperview];
}
- (void) SetCellTitle: (NSString*) _cellTitle {
cellTitle.text = _cellTitle;
}
- (void) SetCellDateTime: (NSString*) _cellDataTime {
cellDataTime.text = _cellDataTime;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
}
- (void)dealloc {
// Call base delloc
[super dealloc];
}
@end
Now when I use my CustomTableViewCell in the code of the program the memory of my iphone always go up !!! Every time when I open tableView the memory grows for 2mb and when I open and close tableView for 10times it become more then 30mb !!! Whot can I do ???
And one more question
How I can get the event when user for example press on my image in custom cell ???
回答1:
In addition to considering cell reuse as others say, if the memory use goes up with each open, you may have a memory leak. Perhaps the view you have that creates the table is not releasing it when deallocated.
回答2:
You aren't reusing your cells. Hence a new cell is created everytime you scroll.
In your delegate you need to recreate cell as follows:
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (nil == cell) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier] autorelease];
}
return cell;
回答3:
Are you implementing cell re-use when creating the cell? There is no indication in the code that you attempt to dequeue a reusable cell from UITableView prior to the init, though this may be in the table view itself. As can be seen in Praveens post, there is an attempt to dequeue a cell, and only if this returns nil is the cell being initialised.
As a result, you may be creating a new cell object every time this particular cell comes into view. Is cell reuse adopted in the table view?
What code is in the tableview delegate method - tableView:cellForRowAtIndexPath?
来源：https://stackoverflow.com/questions/5273782/custom-tableviewcell-example-with-images-and-lables