[Cocoa]_[初级]_[NSPopUpButton重绘实例]

概述场景：比如说，定义一个支持多种格式的控件，包含下拉菜单进行多种选择.由于标准的控件在界面上布局和自己所需的相差很多，所以要对控件进行重绘。 一下是具体实例： 类似于带下拉菜单的文本编辑框。 //// MqjPopUpButton.m// MqjEditContact//// Created by mac-d on 4/28/15.// Copyright (c) 2015 mac

场景：比如说，定义一个支持多种格式的控件，包含下拉菜单进行多种选择.由于标准的控件在界面上布局和自己所需的相差很多，所以要对控件进行重绘。

一下是具体实例：

类似于带下拉菜单的文本编辑框。

////  MqjPopUpbutton.m//  MqjEditContact////  Created by mac-d on 4/28/15.//  copyright (c) 2015 mac-d. All rights reserved.//#import "MqjPopUpbutton.h"@implementation MqjPopUpbutton- (ID)initWithFrame:(NSRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code here.    }        return self;}-(BOol) isFlipped{    return YES;}- (voID)drawRect:(NSRect)dirtyRect{    // Drawing code here.    //[super drawRect:dirtyRect];    [[NScolor colorWithCalibratedRed: 255/255.0 green:255/255.0 blue:255/255.0 Alpha:1] setFill];    NSRectFill(dirtyRect);                Nsstring *path =[[NSBundle mainBundle] pathForResource:@"down" ofType:@"png"];    NSImage *image =[[NSImage alloc] initWithContentsOffile:path];    NSRect rect =NSZeroRect;    rect.size = [image size];    NSPoint p = dirtyRect.origin;    p.x +=dirtyRect.size.wIDth-image.size.wIDth-4;    p.y +=(dirtyRect.size.height-image.size.height)/2;    [image drawInRect:NSMakeRect(p.x,p.y,image.size.wIDth,image.size.height) fromrect:rect operation:NSCompositeSourceOver fraction:1.0 respectFlipped:YES hints:nil];        //画横线    NSBezIErPath *line = [NSBezIErPath bezIErPath];    [line setlinewidth:1];    [[NScolor colorWithCalibratedRed: 147/255.0 green:147/255.0 blue:147/255.0 Alpha:0.5] setstroke];        NSPoint endPoint = dirtyRect.origin;    endPoint.x += dirtyRect.size.wIDth;    [line movetoPoint:dirtyRect.origin];    [line linetoPoint:endPoint];    [line stroke];        [line movetoPoint:NSMakePoint(dirtyRect.origin.x,dirtyRect.origin.y+dirtyRect.size.height)];    [line linetoPoint:NSMakePoint(endPoint.x,dirtyRect.origin.y+dirtyRect.size.height)];    [line stroke];        //画竖线    [line movetoPoint:dirtyRect.origin];    [line linetoPoint:NSMakePoint(dirtyRect.origin.x,dirtyRect.origin.y+dirtyRect.size.height)];    [line stroke];        [line movetoPoint:endPoint];    [line linetoPoint:NSMakePoint(endPoint.x,dirtyRect.origin.y+dirtyRect.size.height)];    [line stroke];        //对选中的item设置勾选    NSArray *array = [super itemArray];    for(NSMenuItem *item in array)    {        if (item == [self selectedItem])        {            [item setState:NSOnState];        }        else        {            [item setState:NSOffState];        }            }         Nsstring *Title =[[super selectedItem] Title];    if (Title == nil)    {        Title = @"";    }    NSLog(@"Title:%@",Title);        //获取字符串的宽度和高度    NSSize TitleSize = [Title sizeWithAttributes:[NSDictionary dictionaryWithObject:[self Font] forKey:NSFontAttributename]];    CGfloat TitleY = dirtyRect.origin.y + (dirtyRect.size.height - TitleSize.height)/2;        NSRect rectTitle = dirtyRect;        rectTitle.origin = NSMakePoint(10,TitleY);        rectTitle.size.height = TitleSize.height;        [Title drawInRect:rectTitle withAttributes:nil];}@end

在MainMenu.xib布局一个NSPopUpbutton,class:改为如图所示。

运行结果：

总结

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