我创建了 NSView 的子类 a 来创建包含 NSTextView 的自定义 UI。因此我使用 drawRect 方法来绘制我的 UI。我还创建了一个 NSImageView 的子类来获取 mousedown 事件。每当我点击我的子类 NSImageView 时，我的 View 的 drawRect 方法就会在无限循环中被调用，我不知道为什么。构建自定义 UI 对我来说是新事物，所以也许我做错了什么？
TWIComposeFrameView.m：
#import "TWIComposeWindowFrameView.h"
#import "TWIImageView.h"
@implementation TWIComposeWindowFrameView
#pragma mark draw Rect of the View
//
// drawRect:
//
// Draws the frame of the window.
//
- (void)drawRect:(NSRect)rect
{
//// Color Declarations
NSColor* mainClrWhite = [NSColor colorWithCalibratedRed: 0.954 green: 0.954 blue: 0.954 alpha: 1];
NSColor* transpGrey = [NSColor colorWithCalibratedRed: 0.224 green: 0.224 blue: 0.224 alpha: 0.745];
NSColor* composeClrGrey = [NSColor colorWithCalibratedRed: 0.858 green: 0.842 blue: 0.842 alpha: 1];
//// Abstracted Attributes
NSRect composeRectRect = NSMakeRect(20, 70, 475, 210);
NSRect attachmentRectRect = NSMakeRect(499, 195, 85, 85);
//// transpRect Drawing
NSBezierPath* transpRectPath = [NSBezierPath bezierPathWithRoundedRect: NSMakeRect(1, 0, 599, 299) xRadius: 10 yRadius: 10];
[transpGrey setFill];
[transpRectPath fill];
//// mainRect Drawing
NSBezierPath* mainRectPath = [NSBezierPath bezierPathWithRoundedRect: NSMakeRect(10, 10, 580, 280) xRadius: 10 yRadius: 10];
[mainClrWhite setFill];
[mainRectPath fill];
//// composeRect Drawing
NSBezierPath* composeRectPath = [NSBezierPath bezierPathWithRoundedRect: composeRectRect xRadius: 10 yRadius: 10];
[composeClrGrey setFill];
[composeRectPath fill];
//// attachmentRect Drawing
NSBezierPath* attachmentRectPath = [NSBezierPath bezierPathWithRoundedRect: attachmentRectRect xRadius: 10 yRadius: 10];
[mainClrWhite setFill];
[attachmentRectPath fill];
[composeClrGrey setStroke];
[attachmentRectPath setLineWidth: 1];
[attachmentRectPath stroke];
}
- (id)initWithFrame:(NSRect)rect
{
if (![super initWithFrame:rect])
return nil;
NSColor* composeClrGrey = [NSColor colorWithCalibratedRed: 0.858 green: 0.842 blue: 0.842 alpha: 1];
NSRect composeRectRect = NSMakeRect(20, 70, 475, 210);
NSRect attachmentRectRect = NSMakeRect(499, 195, 85, 85);
//// Add Controls
[self addComposeTextView:composeClrGrey composeRectRect:composeRectRect];
[self addAttachmentImageView:attachmentRectRect];
return self;
}
#pragma mark -
#pragma mark Add Controls to View
//
// Create and Add the Compose TextView
//
- (void)addComposeTextView:(NSColor *)composeClrGrey composeRectRect:(NSRect)composeRectRect
{
NSTextView *composeTextView;
if (composeTextView == nil)
{
composeTextView = [[NSTextView alloc] initWithFrame:composeRectRect];
[composeTextView setBackgroundColor:composeClrGrey];
[composeTextView setFont:[NSFont fontWithName:@"Helvetica" size:18]];
[composeTextView setRichText:NO];
[self addSubview:composeTextView];
}
}
//
// Create and Add the Attachemant ImageView
//
- (void)addAttachmentImageView:(NSRect)attachmentRectRect
{
NSImage *defaultImage = [NSImage imageNamed:@"168-upload-photo-2"];
NSRect ivRect = NSMakeRect(attachmentRectRect.origin.x + 5, attachmentRectRect.origin.y + 5, attachmentRectRect.size.width - 10, attachmentRectRect.size.height - 10);
TWIImageView *imageView = [[TWIImageView alloc] initWithFrame:ivRect];
imageView.delegate = self;
[imageView setEditable:YES];
[self addSubview:imageView];
[imageView setImage:defaultImage];
}
#pragma mark -
#pragma mark TWIImageView Delegate
//
// mouseDown Event on TWIImageView
//
- (void)myImageView:(TWIImageView *)view mouseDown:(NSEvent *)event
{
NSLog(@"imageView clicked");
}
#pragma mark -
@end
TWIImageView.h
@class TWIImageView;
@protocol TWIImageViewDelegate <NSObject>
- (void)myImageView:(TWIImageView *)view mouseDown:(NSEvent *)event;
@end
@interface TWIImageView : NSImageView
{
}
@property (assign) id<TWIImageViewDelegate> delegate;
@end
TWIImageView.m:
#import "TWIImageView.h"
@implementation TWIImageView
@synthesize delegate = _delegate;
- (void)mouseDown:(NSEvent *)event {
if([self.delegate respondsToSelector:@selector(myImageView:mouseDown:)]) {
[self.delegate myImageView:self mouseDown:event];
}
}
@end
在覆盖的 initWithFrame 方法中创建控件有错吗？还是我的 TWIImageView 缺少重要的东西
堆栈跟踪：
Thread 1, Queue : com.apple.main-thread
#0 0x0000000100001cd0 in -[TWIComposeWindowFrameView drawRect:] at /Users/thomaswickl/Documents/Development/Git Projects/QuickQuick/QuickQuick/TWIComposeWindowFrameView.m:24
#1 0x00007fff92efa170 in -[NSView _drawRect:clip:] ()
#2 0x00007fff92ef6fe3 in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView: ] ()
#3 0x00007fff92ef7a74 in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] ()
#4 0x00007fff93045fdb in -[NSNextStepFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] ()
#5 0x00007fff92ef1d9d in -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] ()
#6 0x00007fff92ebbcc3 in -[NSView displayIfNeeded] ()
#7 0x00007fff93045e94 in -[NSNextStepFrame displayIfNeeded] ()
#8 0x00007fff92ebb1fc in _handleWindowNeedsDisplayOrLayoutOrUpdateConstraints ()
#9 0x00007fff934868f1 in __83-[NSWindow _postWindowNeedsDisplayOrLayoutOrUpdateConstraintsUnlessPostingDisabled]_block_invoke_01208 ()
#10 0x00007fff92b39417 in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ ()
#11 0x00007fff92b39381 in __CFRunLoopDoObservers ()
#12 0x00007fff92b147b8 in __CFRunLoopRun ()
#13 0x00007fff92b140e2 in CFRunLoopRunSpecific ()
#14 0x00007fff90ce8eb4 in RunCurrentEventLoopInMode ()
#15 0x00007fff90ce8b94 in ReceiveNextEventCommon ()
#16 0x00007fff90ce8ae3 in BlockUntilNextEventMatchingListInMode ()
#17 0x00007fff92eb8563 in _DPSNextEvent ()
#18 0x00007fff92eb7e22 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] ()
#19 0x00007fff92eaf1d3 in -[NSApplication run] ()
#20 0x00007fff92e53c06 in NSApplicationMain ()
#21 0x0000000100001242 in main at /Users/thomaswickl/Documents/Development/Git Projects/QuickQuick/QuickQuick/main.m:13
#22 0x00007fff955db7e1 in start ()