我试图将UILabel水平放置.这就是最终看起来像(注意它没有中心).

ReflectionView *aReflectionView = [[ReflectionView alloc]initWithFrame:CGRectMake(((self.view.bounds.size.width / 2) - 150), 40, 300, 90)];
UILabel *aLabel = [[UILabel alloc]initWithFrame:CGRectMake(((self.view.bounds.size.width / 2) - 150), 0, 300, 90)];
aLabel.textAlignment = UITextAlignmentCenter;
aLabel.text = @"1 lbs";
self.weightLabel = aLabel;
[aReflectionView addSubview:self.weightLabel];
self.weightReflectionView = aReflectionView;
[self.view addSubview:self.weightReflectionView ];
[self.weightReflectionView updateReflection];
Run Code Online (Sandbox Code Playgroud) 当我分析我的项目以下代码给我泄漏警告.有没有办法解决我的内存泄漏问题?
警告 :
Potential leak of an object allocated on line 38 and stored into 'addressBook'
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贝娄是我的代码.
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
m_tableDataArray = [[[NSMutableArray alloc] init]autorelease];
NSMutableArray *listDate = [[[NSMutableArray alloc] init]autorelease];
ABAddressBookRef addressBook = ABAddressBookCreate();
NSArray *addresses = (NSArray *) ABAddressBookCopyArrayOfAllPeople(addressBook);
NSInteger addressesCount = [addresses count];
for (int i = 0; i < addressesCount; i++) {
ABRecordRef record = [addresses objectAtIndex:i];
NSString *firstName = (NSString *)ABRecordCopyValue(record, kABPersonFirstNameProperty);
NSString *lastName = (NSString *)ABRecordCopyValue(record, kABPersonLastNameProperty);
if(firstName != nil && lastName …Run Code Online (Sandbox Code Playgroud) 我正在使用cProfile基于列表理解处理字符串的脚本运行基准测试.我想优化的目标行看起来像这样:
signals = [('prefix' + str(day) + '_' + s) for s in signals]
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哪里day是整数.
这条特定的生产线使用了整个运行时间的33%.当然,在执行过程中它被称为百万次.
我已经试过了几个明显的替代方案,其中包括''.join('prefix', str(day), '_', s),'prefix{:}_'.format(day)和使用numpy.core.defchararray.add来连接通过创建一个前缀阵列numpy.tile有signals.它们都比列表理解慢2倍.
这条线路的速度优化还有空间吗?
我正在尝试在我最新的ios项目中使用fmdb,到目前为止它运行得很好.但现在我正在尝试使用NSDate作为参数进行插入,并最终在我的sqlite数据库中存储为无效日期.我尝试了多种解决方案,但似乎没有任何效果.我究竟做错了什么?
[database executeUpdate:@"CREATE TABLE IF NOT EXISTS inspection (ID INTEGER PRIMARY KEY, result TEXT, date_of_inspection DATE, restaurant_id INTEGER"];
NSDate *today=[NSDate date];
[database executeUpdate:@"insert into inspection(id,result,date_of_inspection,restaurant_id) values(?,?,?,?)",[inspection valueForKey:@"id"], result, today, [restaurant valueForKey:@"id"],nil];
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数据库已填充,一切正常,但*#%除外!约会...... :)有什么不对?
ios ×3
objective-c ×3
iphone ×2
cocoa-touch ×1
fmdb ×1
memory-leaks ×1
numpy ×1
optimization ×1
python ×1