iphone - iOS6 UIPickerView 内存泄漏问题。

Question

我遇到了内存泄漏:

[UIPickerTableViewTitleCell initWithStyle:resuableIdentifier]; 

和

NSConcentrateMutableAttributedString.

问题是我没有实现这个委托(delegate)。执行此操作后，现在内存泄漏消失了。这些信息可能对其他人有帮助，因为我花了 16 个小时才弄清楚这个问题。

// Do something with the selected row.
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {

// Get the text of the row.
NSString *rowItem = [NSString stringWithFormat:@"     %@",[machineData objectAtIndex:row]];

// Create and init a new UILabel.
// We must set our label's width equal to our picker's width.
// We'll give the default height in each row.
UILabel *lblRow = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, [pickerView bounds].size.width, 44.0f)];

// Make the text color red.
[lblRow setTextColor: [UIColor blackColor]];
[lblRow setFont:[UIFont boldSystemFontOfSize:20]];

// Center the text.
[lblRow setTextAlignment:UITextAlignmentLeft];

// Add the text.
[lblRow setText:rowItem];

// Clear the background color to avoid problems with the display.
[lblRow setBackgroundColor:[UIColor clearColor]];

// Return the label.
return lblRow;
}

Answer 1

感谢您的信息。被这个泄漏弄糊涂了。只有很少的评论:

• 可能 lblRow 应该自动释放:return [lblRow autorelease];

• [pickerView rowSizeForComponent:component] 可用于获取新标签的大小。