我有一个UITableView（以及相关的Cell），其中包含可变数量的项目。每个单元格内部都是与正在显示的对象关联的值。还有一个按钮，允许用户说明正在显示的任务（来自对象属性）是否完成。它应该改变颜色并变得活跃。这是有效的，除了列表中的最后一项。以下是无效的代码：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"TasksItem"];
[BAPAppDelegate setBorder:[cell viewWithTag:300] withBorder:[BAPAppDelegate darkGreyColor]];
[BAPAppDelegate setBorder:[cell viewWithTag:301] withBorder:[UIColor blackColor]];
[BAPAppDelegate setBorder:[cell viewWithTag:1000] withBorder:[UIColor blackColor]];
ServiceRequest *sr = (mListTasks)[indexPath.row];
[(UILabel *)[cell viewWithTag:110] setText:sr.vSRType];
UILabel *smry = (UILabel *)[cell viewWithTag:301];
smry.text = [NSString stringWithFormat:@"%@", [sr vMTSmry]]; // check if completed
int cnt;
int complete;
UIButton* btn;
cnt = [sr getBeforeRequired];
complete = [sr getBeforeCompleted];
markCompleteButton = YES;
btn = (UIButton *)[cell viewWithTag:120];
if (cnt > 0) {
[btn setHidden:NO];
[btn setTitle:[NSString stringWithFormat:@"%i", cnt] forState:UIControlStateNormal];
} else {
[btn setTitle:@"0" forState:UIControlStateNormal];
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
if (complete < cnt) {
[btn setTitleColor:[BAPAppDelegate redColor] forState:UIControlStateNormal];
[self markComplete:NO];
} else {
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
cnt = [sr getDuringRequired];
complete = [sr getDuringCompleted];
btn = (UIButton *)[cell viewWithTag:121];
if (cnt > 0) {
[btn setHidden:NO];
[btn setTitle:[NSString stringWithFormat:@"%i", cnt] forState:UIControlStateNormal];
} else {
[btn setTitle:@"0" forState:UIControlStateNormal];
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
if (complete < cnt) {
[btn setTitleColor:[BAPAppDelegate redColor] forState:UIControlStateNormal];
[self markComplete:NO];
} else {
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
cnt = [sr getAfterRequired];
complete = [sr getAfterCompleted];
btn = (UIButton *)[cell viewWithTag:122];
if (cnt > 0) {
[btn setHidden:NO];
[btn setTitle:[NSString stringWithFormat:@"%i", cnt] forState:UIControlStateNormal];
} else {
[btn setTitle:@"0" forState:UIControlStateNormal];
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
if (complete < cnt) {
[btn setTitleColor:[BAPAppDelegate redColor] forState:UIControlStateNormal];
[self markComplete:NO];
} else {
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
cnt = [sr getCheckRequired];
complete = [sr getCheckCompleted];
btn = (UIButton *)[cell viewWithTag:123];
if (complete < cnt) {
[btn setTitleColor:[BAPAppDelegate redColor] forState:UIControlStateNormal];
[btn setImage:[UIImage imageNamed:@"check_red.png"] forState:UIControlStateNormal];
[self markComplete:NO];
} else {
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
[btn setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateNormal];
}
btn = (UIButton *)[cell viewWithTag:1000];
[btn setTag:indexPath.row + 1001];
if (markCompleteButton) {
[btn setBackgroundColor:[BAPAppDelegate greenColor]];
[btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[btn setEnabled:YES];
[btn setTitle:@"YEP" forState:UIControlStateNormal];
NSLog(@"YEP %ld", (long)indexPath.row);
} else {
[btn setEnabled:NO];
NSLog(@"NOPE %ld", (long)indexPath.row);
}
[cell prepareForReuse];
return cell;
}
正如预期的那样，日志显示“YEP 8”，但按钮本身没有任何变化。列表中较早的其他按钮会显示并按预期执行操作。
非常感谢任何见解！
答案 0 :(得分：0)
我最终继承了UITableViewCell并将UITableViewCell从我的故事板连接到我的子类，然后将按钮的出口连接到子类。另外，我将按钮的动作设置为子类。
<强> TasksCell.h
@protocol TasksCellDelegate <NSObject>
- (void)buttonPressed:(UIButton *)sender;
@end
@interface TasksCell : UITableViewCell
@property (weak, nonatomic) id<TasksCellDelegate> delegate;
@property (weak, nonatomic) IBOutlet UIButton *button;
- (IBAction)buttonPressed:(UIButton *)sender;
@end
<强> TasksCell.m：
#import "TasksCell.h"
@implementation TasksCell
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
- (IBAction)buttonPressed:(UIButton *)sender {
[self.delegate buttonPressed:sender];
}
@end
<强> TasksViewController.h
#import "TasksCell.h"
<强> TasksViewController.m：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
TasksCell *cell;
cell = [tableView dequeueReusableCellWithIdentifier:@"TasksItem"
forIndexPath:indexPath];
[BAPAppDelegate setBorder:[cell viewWithTag:300] withBorder:[BAPAppDelegate darkGreyColor]];
[BAPAppDelegate setBorder:[cell viewWithTag:301] withBorder:[UIColor blackColor]];
[BAPAppDelegate setBorder:[cell viewWithTag:1000] withBorder:[UIColor blackColor]];
ServiceRequest *sr = (mListTasks)[indexPath.row];
[(UILabel *)[cell viewWithTag:110] setText:sr.vSRType];
UILabel *smry = (UILabel *)[cell viewWithTag:301];
smry.text = [NSString stringWithFormat:@"%@", [sr vMTSmry]]; // check if completed
int cnt;
int complete;
UIButton* btn;
cnt = [sr getBeforeRequired];
complete = [sr getBeforeCompleted];
markCompleteButton = YES;
btn = (UIButton *)[cell viewWithTag:120];
if (cnt > 0) {
[btn setHidden:NO];
[btn setTitle:[NSString stringWithFormat:@"%i", cnt] forState:UIControlStateNormal];
} else {
[btn setTitle:@"0" forState:UIControlStateNormal];
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
if (complete < cnt) {
[btn setTitleColor:[BAPAppDelegate redColor] forState:UIControlStateNormal];
[self markComplete:NO];
} else {
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
cnt = [sr getDuringRequired];
complete = [sr getDuringCompleted];
btn = (UIButton *)[cell viewWithTag:121];
if (cnt > 0) {
[btn setHidden:NO];
[btn setTitle:[NSString stringWithFormat:@"%i", cnt] forState:UIControlStateNormal];
} else {
[btn setTitle:@"0" forState:UIControlStateNormal];
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
if (complete < cnt) {
[btn setTitleColor:[BAPAppDelegate redColor] forState:UIControlStateNormal];
[self markComplete:NO];
} else {
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
cnt = [sr getAfterRequired];
complete = [sr getAfterCompleted];
btn = (UIButton *)[cell viewWithTag:122];
if (cnt > 0) {
[btn setHidden:NO];
[btn setTitle:[NSString stringWithFormat:@"%i", cnt] forState:UIControlStateNormal];
} else {
[btn setTitle:@"0" forState:UIControlStateNormal];
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
if (complete < cnt) {
[btn setTitleColor:[BAPAppDelegate redColor] forState:UIControlStateNormal];
[self markComplete:NO];
} else {
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
}
cnt = [sr getCheckRequired];
complete = [sr getCheckCompleted];
btn = (UIButton *)[cell viewWithTag:123];
if (complete < cnt) {
[btn setTitleColor:[BAPAppDelegate redColor] forState:UIControlStateNormal];
[btn setImage:[UIImage imageNamed:@"aprsi_check_red.png"] forState:UIControlStateNormal];
[self markComplete:NO];
} else {
[btn setTitleColor:[BAPAppDelegate greenColor] forState:UIControlStateNormal];
[btn setImage:[UIImage imageNamed:@"aprsi_check.png"] forState:UIControlStateNormal];
}
[cell.button setTag:indexPath.row + 1001];
if (markCompleteButton) {
cell.button.backgroundColor = [BAPAppDelegate greenColor];
[cell.button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[cell.button setEnabled:YES];
NSLog(@"YEP %ld", (long)indexPath.row);
} else {
[cell.button setTitleColor:[BAPAppDelegate darkGreyColor] forState:UIControlStateDisabled];
[cell.button setBackgroundColor:[BAPAppDelegate lightGreyColor]];
[cell.button setEnabled:NO];
NSLog(@"NOPE %ld", (long)indexPath.row);
}
[cell prepareForReuse];
return cell;
}
允许按钮按预期工作，我在TasksViewController中保留了按钮委托，但同样可以轻松地将其移动到子类。希望这可以帮助别人！