[英]question about init and load from xib for a custom UIView
我正在尝试创建一个自定义UIView类,该类将从包含该视图接口的xim文件加载。 我正在尝试在自定义视图的init方法中封装[NSBundle mainBundle] loadNibNamed ...],如下所示:
- (id)init
{
self = [super init];
if (self)
{
NSArray* nibViews = [[NSBundle mainBundle] loadNibNamed:@"LoadingV" owner:self options:nil];
self = [(LoadingV*)[nibViews objectAtIndex: 0] retain];
}
return self;
}
我想知道:
干杯AF
不,这是不可接受的,这是不正确的做法,实际上您那里存在内存泄漏。
更好的方法是使用称为“工厂”的模式。
例:
@interface CustomView: UIView
@end
@implementation CustomView
- (void)awakeFromNib {
// custom view loaded from nib
}
@end
@interface UIView (Nib)
+ (UIView *)viewFromNib:(NSString *)nibName bundle:(NSBundle *)bundle;
@end
@implementation UIView (Nib)
+ (UIView *)viewFromNib:(NSString *)nibName bundle:(NSBundle *)bundle {
if (!nibName || [nibName length] == 0) {
return nil;
}
UIView *view = nil;
if (!bundle) {
bundle = [NSBundle mainBundle];
}
// I assume, that there is only one root view in interface file
NSArray *loadedObjects = [bundle loadNibNamed:nibName owner:nil options:nil];
view = [loadedObjects lastObject];
return view;
}
@end
用法:
// CustomView.xib contains one View object with its class set to "CustomView"
CustomView *myView = (CustomView *)[UIView viewFromNib:@"CustomView" bundle:nil];
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