[英]How to clear all object on NSView in Cocoa
我想在调用任何函数之前清除添加到NSVIew的所有对象。 我怎样才能做到这一点?
我使用以下功能
-(void)clearAllSubviewsOfView :(NSView *)parent
{
for (NSView *subview in [parent subviews]) {
[subview removeFromSuperview];
}
}
您可以进行如下操作:
// TSClearSupporting.h
@protocol TSClearSupporting <NSObject>
- (void) clear;
@end
// TSTextField.h
#import <Cocoa/Cocoa.h>
#import "TSClearSupporting.h"
@interface TSTextField : NSTextField <TSClearSupporting>
@end
// TSTextField.m
#import "TSTextField.h"
@implementation TSTextField
- (void) clear
{
self.stringValue = @"";
}
@end
// TSMainView.m
#import "TSMainView.h"
#import "TSClearSupporting.h"
@implementation TSMainView
- (IBAction) clearAll: (id)sender
{
NSArray* subViews = self.subviews;
for (NSView* view in subViews)
{
if ([view conformsToProtocol: @protocol(TSClearSupporting)])
{
[view performSelector: @selector(clear)];
}
}
}
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