我有这样的方法，并且很难优化它以更好地运行。100 个单位大约需要 1 秒，并且在 和 之间进行 4NSLog(@"Debug2")次NSLog(@"Debug3")。在 iPhone 上 2 秒。随着更多的单位，它需要更多。250 个单位和 5 次在 mac 上需要 1.7 秒，在 iphone 上需要 3.2 秒。
我不认为表现在于一个周期内的周期。由于 250 * 5 = 1250，对于计算机来说处理速度不应该太多。
方法思路：
输入：NSMutableArray times - 包含时间 (2012-12-12, 2013-01-19) 等 NSMutableArray objectArray - 包含LogUnit对象。输出：计算视图数组。
主要思想：每个时间的视图，其中包含时间相同的 ObjectArray 中的对象。
我通过显示一小部分对象（参见counted代码和_breakPlease）使其更快，但它仍然不够快。
- (NSMutableArray*) sortViews: (NSMutableArray *)times and:(NSMutableArray *)objectArray
{
NSLog(@"debug2");
NSMutableArray *views = [[NSMutableArray alloc] initWithCapacity:times.count];
NSString *number = [NSString stringWithFormat:@"SortLog%i ",[[NSUserDefaults standardUserDefaults] stringForKey:@"ObjectNumber"].intValue];
NSString *comp = [[NSUserDefaults standardUserDefaults] stringForKey:number];
LogUnit *unit;
int counted = 0;
for(int x = 0; x != times.count; x++)
{
@autoreleasepool {
UIView *foo = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 400)];
foo.backgroundColor = [UIColor clearColor];
int f = 0;
int h = 0;
NSString *attributeName = @"realTime";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K IN %@", attributeName, [times objectAtIndex:x]];
// Filter the objectArray by the time, so we don't have to run through all the objects in objectArray, and check if time is right.
NSArray *filtered = [objectArray filteredArrayUsingPredicate:predicate];
for(int i = 0; i != filtered.count; i++)
{
unit = [filtered objectAtIndex:i];
// Filter units by user choice (comp). Like comp = Warnings or comp = Errors and etc.
if([[unit status] isEqualToString:comp] || [comp isEqualToString:NULL] || comp == NULL)
{
// testing if the unit is correct to use
if([unit getEvent] != NULL)
{
// below is some computation for frames, to get them to proper position
unit.view.frame = CGRectMake(unit.view.frame.origin.x, f * unit.view.frame.size.height + 30, unit.view.frame.size.width, unit.view.frame.size.height);
[foo addSubview:unit.view];
counted++;
f++;
h = unit.view.frame.size.height * f;
}
}
}
UILabel *myLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, 30)];
myLabel.backgroundColor = [UIColor clearColor];
myLabel.font = [UIFont boldSystemFontOfSize:20];
myLabel.textColor = [UIColor colorWithRed:88 green:154 blue:251 alpha:1];
myLabel.textAlignment = UITextAlignmentCenter;
myLabel.text = [times objectAtIndex:x];
// Just adding a label with "2012-12-30" or etc on top of the view.
[foo addSubview:myLabel];
foo.frame = CGRectMake(0,0, 320, h + 30 );
h = 0;
[views addObject:foo];
// counting added views for performance, if more than 30, return, and show only small portion of whole units, user has the option to show all the units if he wants to, but that takes a time to load..
if(counted > 30 && filtered.count != counted)
{
if(_breakPlease == false)
{
_broken = true;
break;
}
}
}
}
NSLog(@"debug3");
return views;
}