遇到这么一个泄漏事件：
环境：Xcode 4.2.1，mac 10.7.1先看代码：.h
View Code 1 @interface TableController : UITableViewController2 3 @property (nonatomic ,retain) NSArray *DataSource;4 5 @end
1 #import "TableController.h" 2 #import "TableView.h" 3 #import "CellItem.h" 4 #import "Et.h" 5 6 #import "DetailController.h" 7 8 @implementation TableController 9 10 @synthesize DataSource = _DataSource; 11 12 - (void)defaultValues 13 { 14 self->_DataSource = nil; 15 } 16 17 - (void)loadDatasFromDB 18 { 19 if (self->_DataSource) 20 [self->_DataSource release]; 21 self->_DataSource = nil; 22 23 // load data from db 24 // test code b 25 NSMutableArray *mutDatas = [[NSMutableArray alloc] init]; 26 27 for (int i=0; i<10; i++) 28 { 29 Et *item = [[Et alloc] init]; 30 item.ID = i; 31 item.RecordDate = [NSDate date]; 32 item.Content = [NSString stringWithFormat:@"%d,%@",i ,item.RecordDate]; 33 34 [mutDatas addObject:item]; 35 36 [item release]; 37 } 38 39 self->_DataSource = [[NSArray alloc] initWithArray:mutDatas]; 40 [mutDatas removeAllObjects]; 41 [mutDatas release]; 42 mutDatas = nil; 43 // test code e 44 } 45 46 - (void)gotoView:(id)sender 47 { 48 DetailController *detailViewController = [[DetailController alloc] init]; 49 [self.navigationController pushViewController:detailViewController animated:YES]; 50 [detailViewController release]; 51 } 52 53 - (void)navSetting 54 { 55 self.navigationItem.title = @"Title"; 56 57 UIBarButtonItem *btnSettings 58 = [[UIBarButtonItem alloc] initWithTitle:@"+" 59 style:UIBarButtonItemStyleBordered 60 target:self 61 action:@selector(gotoView:)]; 62 self.navigationItem.rightBarButtonItem = btnSettings; 63 [btnSettings release]; 64 } 65 66 - (id)init 67 { 68 self = [super init]; 69 if (self) 70 { 71 [self defaultValues]; 72 [self loadDatasFromDB];/// ------注意：LeakProblem 73 } 74 75 return self; 76 } 77 78 - (id)initWithStyle:(UITableViewStyle)style 79 { 80 self = [super initWithStyle:style]; 81 if (self) { 82 // Custom initialization 83 [self defaultValues]; 84 [self loadDatasFromDB];/// ------注意：LeakProblem 85 } 86 return self; 87 } 88 89 - (void)dealloc 90 { 91 if (self.DataSource) 92 [self->_DataSource release]; 93 94 [self defaultValues]; 95 96 [super dealloc]; 97 } 98 99 - (void)didReceiveMemoryWarning100 {101 // Releases the view if it doesn't have a superview.102 [super didReceiveMemoryWarning];103 104 // Release any cached data, images, etc that aren't in use.105 }106 107 #pragma mark - View lifecycle108 109 - (void)loadView110 { 111 TableView *v = [[TableView alloc] init];112 v.dataSource = self;113 v.delegate = self;114 self.view = v;115 [v release];116 }117 118 - (void)viewDidLoad119 {120 [super viewDidLoad];121 122 // Uncomment the following line to preserve selection between presentations.123 // self.clearsSelectionOnViewWillAppear = NO;124 125 // Uncomment the following line to display an Edit button in the navigation bar for this view controller.126 // self.navigationItem.rightBarButtonItem = self.editButtonItem;127 [self navSetting];128 129 [self loadDatasFromDB];/// ------注意：LeakProblem 修复方式130 }131 132 - (void)viewDidUnload133 {134 [super viewDidUnload];135 // Release any retained subviews of the main view.136 // e.g. self.myOutlet = nil;137 138 if (self->_DataSource)139 [self->_DataSource release];140 self->_DataSource = nil;141 }142 143 - (void)viewWillAppear:(BOOL)animated144 {145 [super viewWillAppear:animated];146 }147 148 - (void)viewDidAppear:(BOOL)animated149 {150 [super viewDidAppear:animated];151 }152 153 - (void)viewWillDisappear:(BOOL)animated154 {155 [super viewWillDisappear:animated];156 }157 158 - (void)viewDidDisappear:(BOOL)animated159 {160 [super viewDidDisappear:animated];161 }162 163 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation164 {165 // Return YES for supported orientations166 return (interfaceOrientation == UIInterfaceOrientationPortrait);167 }168 169 #pragma mark - Table view data source170 171 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView172 {173 //#warning Potentially incomplete method implementation.174 // Return the number of sections.175 if (self.DataSource)176 return 1;177 return 0;178 }179 180 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section181 {182 //#warning Incomplete method implementation.183 // Return the number of rows in the section.184 if (self.DataSource)185 return self.DataSource.count;186 return 0;187 }188 189 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath190 {191 static NSString *CellIdentifier = @"Cell";192 193 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];194 if (cell == nil) 195 {196 cell = [[[CellItem alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];197 198 if (self.DataSource)199 {200 if (self.DataSource.count > indexPath.row)201 {202 id cellData = [self.DataSource objectAtIndex:indexPath.row];203 204 if ([cellData isKindOfClass:[Et class]])205 {206 Et *etItem = (Et *)cellData;207 208 CellItem *c = (CellItem *)cell;209 210 if (etItem.RecordDate)211 {212 NSRange range;213 range.location = 0;214 range.length = 10;215 [c.LblRecordDate setText:[[NSString stringWithFormat:@"%@" ,etItem.RecordDate] substringWithRange:range]];216 }217 218 if (etItem.Content)219 {220 NSRange range;221 range.location = 0;222 if (etItem.Content.length >10)223 range.length = 10;224 else225 range.length = etItem.Content.length;226 [c.LblSimpleContent setText:[etItem.Content substringWithRange:range]];227 }228 229 if (c.LblRecordDate)230 [c addSubview:c.LblRecordDate];231 232 if (c.LblSimpleContent)233 [c addSubview:c.LblSimpleContent];234 }235 236 }237 }238 }239 240 return cell;241 }242 243 /*244 // Override to support conditional editing of the table view.245 - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath246 {247 // Return NO if you do not want the specified item to be editable.248 return YES;249 }250 */251 252 /*253 // Override to support editing the table view.254 - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath255 {256 if (editingStyle == UITableViewCellEditingStyleDelete) {257 // Delete the row from the data source258 [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];259 } 260 else if (editingStyle == UITableViewCellEditingStyleInsert) {261 // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view262 } 263 }264 */265 266 /*267 // Override to support rearranging the table view.268 - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath269 {270 }271 */272 273 /*274 // Override to support conditional rearranging of the table view.275 - (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath276 {277 // Return NO if you do not want the item to be re-orderable.278 return YES;279 }280 */281 282 #pragma mark - Table view delegate283 284 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath285 {286 // Navigation logic may go here. Create and push another view controller.287 /*288 <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];289 // ...290 // Pass the selected object to the new view controller.291 [self.navigationController pushViewController:detailViewController animated:YES];292 [detailViewController release];293 */294 295 NSLog(@"%d" ,indexPath.row);296 }297 298 @end 代码中/// ------注意：LeakProblem和/// ------注意：LeakProblem 修复方式 两处语句互斥，不同时存在
保留/// ------注意：LeakProblem，删除/// ------注意：LeakProblem 修复方式使用Analyze工具分析，没有泄漏代码使用Profile工具分析，会出现loadDatasFromDB中一个NSArray数组以及10个内容泄漏在调试中，尝试关闭loadDatasFromDB，在applicationDelegate.m中定义一个数组，赋予给属性Datasource，分别用上述工具再次分析，发现无泄漏思考再三，移出在init中对loadDatasFromDB函数的调用，在viewDidLoad中调用就是：删除/// ------注意：LeakProblem，保留/// ------注意：LeakProblem 修复方式又用上述工具分析，无泄漏至于为什么第一种方式会导致profile泄漏，暂时没有找到合适说法晚点再用xcode4.3.2试下【尝试了，和上述结论一样】2012-06-28