loadNibName 方法太慢 - 如何使其更快?
我有一个滚动视图,其中包含大约 40-50 个不同类型的对象。对象的类型根据对象位置的函数来定义(例如,如果是滚动视图中的第 5 个对象 -> 是 Object1,如果它是滚动视图中的第 11 个对象 -> 它是 Object2 类型等)。 使用 for 我正在验证数组的每个元素,然后使用以下方法将它们放入滚动视图中:
for (int i = 0; i < [myArray count]; i++){
if (i < 10){
NSArray *xib = [[NSBundle mainBundle] loadNibNamed:@"Class1" owner:nil options:nil];
for (NSObject *obj in xib){
if ([obj isKindOfClass:[Class1 class]]){
classObject = (Class1 *)obj;
break;
}
}
} else if (i > 10 && i < 20){
NSArray *xib = [[NSBundle mainBundle] loadNibNamed:@"Class2" owner:nil options:nil];
for (NSObject *obj in xib){
if ([obj isKindOfClass:[Class2 class]]){
classObject = (Class2 *)obj;
break;
}
}
}
[scrollview addSubview:classObject];
}
我的问题是,它加载速度非常慢。我该怎么做才能让它更快?
I have a scroll view, which contains about 40-50 objects of different types. The object's types are defined in function of the object's location (for ex. if is the 5th object in the scroll view-> is's Object1, if it is the 11th object in the scroll view -> it's Object2 type etc.).
With a for I am verifying each element of an array, and then putting them into the scroll view, with this method:
for (int i = 0; i < [myArray count]; i++){
if (i < 10){
NSArray *xib = [[NSBundle mainBundle] loadNibNamed:@"Class1" owner:nil options:nil];
for (NSObject *obj in xib){
if ([obj isKindOfClass:[Class1 class]]){
classObject = (Class1 *)obj;
break;
}
}
} else if (i > 10 && i < 20){
NSArray *xib = [[NSBundle mainBundle] loadNibNamed:@"Class2" owner:nil options:nil];
for (NSObject *obj in xib){
if ([obj isKindOfClass:[Class2 class]]){
classObject = (Class2 *)obj;
break;
}
}
}
[scrollview addSubview:classObject];
}
My problem is, that it loads very slowly. What can I do to make it quicker?
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如果您正在针对 IOS4+ 进行编程,则可以使用 UINib 类代替。它将加载缓存的对象并在每次需要时创建一个副本。请参阅这篇博文< /a>.
If you are programming for IOS4+, you can use the UINib class instead. It will load a cached objects and create a copy each time needed. See this blog post.