在UITableView中画竖线

 

自定义类，从UITableViewCell继承,头文件如下：

 

#import <UIKit/UIKit.h>

 

 

@interface MyTableCell : UITableViewCell {

 

NSMutableArray *columns;

}

 

- (void)addColumn:(CGFloat)position;

 

@end

 

 

 

实现文件如下：

 

 

 

#import "MyTableCell.h"

@implementation MyTableCell

 

- (id)initWithFrame:(CGRect)frame reuseIdentifier:(NSString *)reuseIdentifier {

// if (self = [super initWithFrame:frame reuseIdentifier:reuseIdentifier]) {

if (self = [super initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier]) {

// Initialization code

columns = [[NSMutableArray alloc] initWithCapacity:5];

}

return self;

}

 

 

- (void)addColumn:(CGFloat)position {

 

[columns addObject:[NSNumber numberWithFloat:position]];

}

 

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {

 

[super setSelected:selected animated:animated];

 

// Configure the view for the selected state

}

 

- (void)drawRect:(CGRect)rect { 

if (0 < [columns count]) {

CGContextRef ctx = UIGraphicsGetCurrentContext();

// just match the color and size of the horizontal line

// CGContextSetRGBStrokeColor(ctx, 0.5, 0.5, 0.5, 1.0); 

CGContextSetRGBStrokeColor(ctx, 0, 0, 0, 1.0); 

// CGContextSetLineWidth(ctx, 0.25);

CGContextSetLineWidth(ctx, 0.5);

for (int i = 0; i < [columns count]; i++) {

// get the position for the vertical line

CGFloat f = [((NSNumber*) [columns objectAtIndex:i]) floatValue];

CGContextMoveToPoint(ctx, f, 0);

CGContextAddLineToPoint(ctx, f, self.bounds.size.height);

}

CGContextStrokePath(ctx);

}

[super drawRect:rect];

} 

 

 

- (void)dealloc {

[columns release];

[super dealloc];

}

 

 

@end

 

然后在以下函数中，用MyTableCell替代UITableViewCell

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{