我使用 NSTextfield 的自己的 OMNTextfield 子类来显示文本,并在文本长度大于控件宽度时对文本进行动画处理。
文本是动画的,就像 iTunes 中的歌曲标题一样。它就像一个魅力!
现在我想更改文本的颜色和文本对齐方式。我搜索了一段时间 setTextcolor、setAlignment、viewWillDraw、cellClass,...但没有任何效果 => 我的文本仍然是黑色!
You can find the complete code here (Xcode project)
我的问题:如何更改 NSTextfield 子类中的文本颜色/对齐方式?
协调to this post下面的代码应该可以工作,但事实并非如此!
-(void)viewWillDraw { // or whatever is the Appkit equivalent
[super setTextColor:[NSColor redColor]];
}
完整代码:
//
// OMNTextField.h
#import <Cocoa/Cocoa.h>
@interface OMNTextField : NSTextField {
NSTimer * scroller;
NSPoint point;
NSString * text;
NSTimeInterval speed;
CGFloat stringWidth;
}
- (void) setText:(NSString *)newText;
@property (nonatomic, copy) NSString * text;
@property (nonatomic) NSTimeInterval speed;
@end
//
// OMNTextField.m
#import "OMNTextField.h"
@implementation OMNTextField
@synthesize text;
@synthesize speed;
- (void) dealloc {
[text release];
[scroller invalidate];
[super dealloc];
}
- (void) setText:(NSString *)newText {
NSLog(@"[%@ %@] *** ", NSStringFromClass([self class]), NSStringFromSelector(_cmd));
[text release];
text = [newText copy];
point = NSZeroPoint;
stringWidth = [newText sizeWithAttributes:nil].width;
if (scroller == nil && speed > 0 && text != nil) {
scroller = [NSTimer scheduledTimerWithTimeInterval:speed target:self selector:@selector(moveText:) userInfo:nil repeats:YES];
}
}
- (void) setSpeed:(NSTimeInterval)newSpeed {
if (newSpeed != speed) {
speed = newSpeed;
[scroller invalidate];
if (speed > 0 && text != nil) {
scroller = [NSTimer scheduledTimerWithTimeInterval:speed target:self selector:@selector(moveText:) userInfo:nil repeats:YES];
}
}
}
-(void)viewWillDraw {
[super setTextColor:[NSColor yellowColor]];
}
- (void) moveText:(NSTimer *)timer {
if (stringWidth >= self.frame.size.width)
point.x = point.x - 1.0f;
[self setNeedsDisplay:YES];
}
- (void)drawRect:(NSRect)dirtyRect {
CGFloat max;
if (stringWidth >= dirtyRect.size.width)
max = stringWidth;
else
max = dirtyRect.size.width;
if (point.x + stringWidth < 0) {
point.x += max ;
}
[text drawAtPoint:point withAttributes:nil];
if (point.x < 0) {
NSPoint otherPoint = point;
otherPoint.x += max;
[text drawAtPoint:otherPoint withAttributes:nil];
}
}
@end
//
// AppDelegate.h
#import <Cocoa/Cocoa.h>
#import "OMNTextField.h"
@interface AppDelegate : NSObject <NSApplicationDelegate>
{
}
@property (assign) IBOutlet OMNTextField *label2;
@property (assign) IBOutlet OMNTextField *label3;
@property (assign) IBOutlet NSWindow *window;
@property (assign) IBOutlet NSView *view;
@end
//
// AppDelegate.m
#import "AppDelegate.h"
@implementation AppDelegate
- (void)dealloc
{
[super dealloc];
}
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
[self.label2 setText:@"Too shoort no need to move"];
[self.label2 setSpeed:0.05];
[self.label3 setText:@"Text Lenght > TextField.width => Automatically animate text to show all"];
[self.label3 setSpeed:0.05];
}
@end
PS:我的代码基于 Dave Delong 代码:iTunes Song Title Scrolling in Cocoa
最佳答案
更换线路
[text drawAtPoint:point withAttributes:nil];
与
NSColor *color = [NSColor greenColor]; \\put something else here...
NSDictionary *attributes = [NSDictionary dictionaryWithObject:color forKey:NSForegroundColorAttributeName];
[text drawAtPoint:point withAttributes:attributes];
关于objective-c - 如何更改自定义 NSTextfield 的绘制矩形内的文本颜色,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12863058/