我正在嘗試實作一個委托方法，NSTextField如Apple 的
無需添加自定義子類。
或者，您可以將自定義文本欄位子類化為自己的委托。沿著這些路線的東西：
#import "MyTextFieldSubclass.h"
@interface MyTextFieldSubclass() <NSTextFieldDelegate>
@end
@implementation MyTextFieldSubclass
- (instancetype)init {
self = [super init];
if (self) {
self.delegate = self;
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)coder {
self = [super initWithCoder:coder];
if (self) {
self.delegate = self;
}
return self;
}
- (instancetype)initWithFrame:(NSRect)frameRect {
self = [super initWithFrame:frameRect];
if (self) {
self.delegate = self;
}
return self;
}
- (void)drawRect:(NSRect)dirtyRect {
[super drawRect:dirtyRect];
// Drawing code here.
}
- (BOOL)control:(NSControl *)control textView:(NSTextView *)textView doCommandBySelector:(SEL)commandSelector {
BOOL result = NO;
if (commandSelector == @selector(insertNewline:))
{
// new line action:
// always insert a line-break character and don’t cause the receiver to end editing
[textView insertNewlineIgnoringFieldEditor:self];
result = YES;
}
else if (commandSelector == @selector(insertTab:))
{
// tab action:
// always insert a tab character and don’t cause the receiver to end editing
[textView insertTabIgnoringFieldEditor:self];
result = YES;
}
return result;
}
@end
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