我正在尝试在大纲视图中制作单元格，就像我们在 Skype 消息窗口中为用户所做的那样。
- 为此，我创建了一个自定义类：
IconNameCell.h
@interface IconNameCell : NSTextFieldCell {
//@private
NSImage *userImage; // size (17,17)
NSImage *statusIcon; // size (14,14)
NSString *cellText;
}
@property (readwrite, retain) NSImage *userImage;
@property (readwrite, retain) NSImage *statusIcon;
@property (readwrite, retain) NSString *cellText;
- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView;
@end
IconNameCell.m
@implementation IconNameCell
@synthesize userImage;
@synthesize statusIcon;
@synthesize cellText;
- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView{
@try{
// Inset the cell frame to give everything a little horizontal padding
NSRect anInsetRect = NSInsetRect(cellFrame,2.0,0);
//FIXME: flip coordinates and size can be set in accessor methods
// setting userImage and statusIcon in flipped coordinate
[userImage setFlipped:YES];
[statusIcon setFlipped:YES];
// setting size of image and icon
[userImage setSize:NSMakeSize(25.0, 25.0)];
[statusIcon setSize:NSMakeSize(15.0, 17.0)];
// setting attributes of cell text
NSMutableParagraphStyle *dParagraphStyle = [[NSMutableParagraphStyle alloc] init];
[dParagraphStyle setAlignment:NSLeftTextAlignment];
NSColor *colorOfText;
if ([self isHighlighted]) {
colorOfText = [NSColor whiteColor];
}
else {
colorOfText = [NSColor blackColor];
}
NSMutableDictionary * dTitleAttributes = [[NSMutableDictionary alloc] initWithObjectsAndKeys:
colorOfText,NSForegroundColorAttributeName,
[NSFont systemFontOfSize:11.0],NSFontAttributeName,
dParagraphStyle, NSParagraphStyleAttributeName,
nil];
// getting sizes
NSSize cellTextSize = [cellText sizeWithAttributes:dTitleAttributes];
NSSize userImageSize = [userImage size];
NSSize statusIconSize = [statusIcon size];
// making layout boxes for all elements
// vertical padding between the lines of text
float dVerticalPadding = 2.0;
// horizontal padding between two images
float padBtwnImgs = 4.0;
// horizontal padding between image and text
float padBtwnImgText = 6.0;
NSString *userImageName = [userImage name];
NSLog(@"userImageName - %@ / cellText- %@",userImageName,cellText); // getting null for userImageName
//if ([userImageName isEqualToString:@"current_D.png"]) {
//FIXME: this is juggad and should be corrected
NSRange rangeOfComma = [cellText rangeOfString:@","];
if (rangeOfComma.length !=0 ) {
//<#statements#>
// userImage box: center the userImage vertically inside of the inset rect
NSRect cellTitleBox = NSMakeRect(anInsetRect.origin.x,
anInsetRect.origin.y + anInsetRect.size.height*.5 - cellTextSize.height*.5,
cellTextSize.width,
cellTextSize.height);
// drawing cell text
[cellText drawInRect:cellTitleBox withAttributes:dTitleAttributes];
}
else {
// userImage box: center the userImage vertically inside of the inset rect
NSRect userImageBox = NSMakeRect(anInsetRect.origin.x,
anInsetRect.origin.y + anInsetRect.size.height*.5 - userImageSize.height*.5,
userImageSize.width,
userImageSize.height);
// statusIcon box: center the statusIcon vertically inside of the inset rect
NSRect statusIconBox = NSMakeRect(userImageBox.origin.x + userImageBox.size.width + padBtwnImgs,
anInsetRect.origin.y + anInsetRect.size.height*.5 - statusIconSize.height*.5,
statusIconSize.width,
statusIconSize.height);
// cellTitleBox: vertically aligning text
NSRect cellTitleBox = NSMakeRect(statusIconBox.origin.x + statusIconBox.size.width + padBtwnImgText,
anInsetRect.origin.y + anInsetRect.size.height*.5 - cellTextSize.height*.5,
cellTextSize.width,
cellTextSize.height);
// drawing user image
[userImage drawInRect:userImageBox fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0];
// drawing user status
[statusIcon drawInRect:statusIconBox fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0];
// drawing cell text
[cellText drawInRect:cellTitleBox withAttributes:dTitleAttributes];
}
}
@catch (NSException *e) {
NSLog(@"IconNameCell -%@",e);
}
}
@end
2，我为大纲视图分配了文本字段单元格：IB中的IconNameCell
第三，我在委托中使用此代码在自定义单元格中设置图像、图标和用户名称-
- (void)outlineView:(NSOutlineView *)outlineView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn item:(id)item{
if ([[tableColumn identifier] isEqualToString:@"userInfo"]) {
// some relevant code
if( [[item onlineStatus] intValue] == 0 ){
[cell setStatusIcon:[NSImage imageNamed:@"offline.png"]];
}
else{
[cell setStatusIcon:[NSImage imageNamed:@"online.png"]];
}
//similarly, setting attribute for userImage and cellText
}
我面临两个问题： 1. 当我在大纲视图中选择一行或另一行时，应用程序经常崩溃。早些时候，当我没有使用自定义单元格而是三个不同的列时 - 用户图像、用户状态和用户名，它工作正常！2.对于日志：NSLog(@"userImageName - %@ / cellText- %@",userImageName,cellText); 我得到 (null) 作为 userImageName，虽然我应该得到一些字符串值。
谁能建议我一些解决方案？
谢谢，
米拉杰