How do I create a modal sheet window exclusively by programming - objective-c

Question

How do I create a modal sheet window exclusively by programming. Interface builder seems to me over the hand, I'm at the beginning and I want to learn programming, not how I arrange some elements graphically.
I've heard on several programmers that is possible.
I tried without success:
#interface AppDelegate : NSObject <NSApplicationDelegate> {
NSWindow* mywindow;
NSButton* button;
IBOutlet NSPanel* theSheet;
}
- (void) buildWnd;
#end
#implementation AppDelegate
- (void) buildWnd {
button = [[[NSButton alloc] initWithFrame:NSMakeRect(50, 225, 90, 25)] autorelease];
[button setTitle:#"button"];
[button setTarget:self];
[button setAction:#selector(OnbuttonClick:)];
[button setAutoresizingMask:NSViewMaxXMargin | NSViewMinYMargin];
mywindow = [[NSWindow alloc] initWithContentRect: NSMakeRect(100, 100, 700, 500) styleMask: NSWindowStyleMaskTitled | NSWindowStyleMaskMiniaturizable | NSWindowStyleMaskClosable | NSWindowStyleMaskResizable backing: NSBackingStoreBuffered defer: NO];
[mywindow center];
[mywindow setTitle:#"Sheet example"];
[[mywindow contentView] addSubview:button];
[mywindow setIsVisible:YES];
}
- (IBAction) showTheSheet:(id)sender {
}
-(IBAction) endTheSheet:(id)sender {
[mywindow endSheet: theSheet];
}
- (void) applicationWillFinishLaunching: (NSNotification *)notification {
[self buildMenu];
[self buildWnd];
}
- (void) applicationDidFinishLaunching: (NSNotification *)notification {
}
- (IBAction) OnButtonClick:(id)sender {
NSLog(#"OnButtonClick");
[mywindow beginSheet: theSheet
completionHandler:^(NSModalResponse returnCode) {
[NSApp stopModalWithCode: returnCode];
}];
[NSApp runModalForWindow: theSheet];
}
#end
int main() {
NSApplication *application = [NSApplication sharedApplication];
AppDelegate *appDelegate = [[AppDelegate alloc] init];
[application setDelegate:appDelegate];
[application run];
return 0;
}
I receive this error message: AppDelegate OnbuttonClick: unrecognized selector sent to instance.
Where I'm wrong please?

Answer 1

You neglected to set up the sheet. This example should run in Xcode by replacing the main.m with the code below and deleting the pre-supplied AppDelegate files:
#import <Cocoa/Cocoa.h>
#interface AppDelegate : NSObject <NSApplicationDelegate> {
NSWindow *window;
NSPanel *sheet;
}
- (void) buildWnd;
#end
#implementation AppDelegate
- (void) showBtnAction:(id)sender {
[window beginSheet: sheet completionHandler:^(NSModalResponse returnCode) {
[NSApp stopModalWithCode: returnCode];
}];
[NSApp runModalForWindow: sheet];
}
-(void) hideSheet:(id)sender {
[window endSheet: sheet];
}
- (void) buildWnd {
window = [[NSWindow alloc] initWithContentRect: NSMakeRect(100, 100, 700, 500) styleMask: NSWindowStyleMaskTitled | NSWindowStyleMaskMiniaturizable | NSWindowStyleMaskClosable | NSWindowStyleMaskResizable backing: NSBackingStoreBuffered defer: NO];
[window center];
[window setTitle:#"Sheet example"];
[window setIsVisible:YES];
// **** Sheet Panel **** //
sheet = [[NSPanel alloc] initWithContentRect:NSMakeRect( 0, 0, 500, 450 )
styleMask:NSWindowStyleMaskDocModalWindow backing:NSBackingStoreBuffered defer:YES];
[sheet center];
[sheet setTitle:#"NSPanel"];
// **** OK Button on Sheet **** //
NSButton *okayBtn = [[NSButton alloc] initWithFrame:NSMakeRect(50, 225, 50, 25)];
[okayBtn setTitle:#"OK"];
[okayBtn setBezelStyle:NSBezelStyleRounded ];
[okayBtn setTarget:self];
[okayBtn setAction:#selector(hideSheet:)];
[[sheet contentView] addSubview:okayBtn];
// **** Show Button **** //
NSButton *showBtn = [[NSButton alloc] initWithFrame:NSMakeRect(50, 225, 150, 25)];
[showBtn setTitle:#"Show sheet"];
[showBtn setBezelStyle:NSBezelStyleRounded ];
[showBtn setAction:#selector(showBtnAction:)];
[showBtn setAutoresizingMask:NSViewMaxXMargin | NSViewMinYMargin];
[[window contentView] addSubview:showBtn];
// **** Quit btn **** //
NSButton *quitBtn = [[NSButton alloc]initWithFrame:NSMakeRect(650, 5, 40, 40 )];
[quitBtn setBezelStyle:NSBezelStyleCircular ];
[quitBtn setTitle: #"Q" ];
[quitBtn setAutoresizingMask: NSViewMinXMargin];
[quitBtn setAction:#selector(terminate:)];
[[window contentView] addSubview: quitBtn];
}
- (void) applicationWillFinishLaunching: (NSNotification *)notification {
[self buildWnd];
}
- (void) applicationDidFinishLaunching: (NSNotification *)notification {
}
#end
int main() {
NSApplication *application = [NSApplication sharedApplication];
AppDelegate *appDelegate = [[AppDelegate alloc] init];
[application setDelegate:appDelegate];
[application run];
return 0;
}