绘制自定义控件代码笔记

@implementation HPMailDirectDrawCell

-(instancetype)init {
self = [super init];
if(self) {
[self setup];
}
return self;
}

-(id)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if(self) {
[self setup];
}
return self;
}

-(instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if(self) {
[self setup];
}
return self;
}

-(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if(self) {
[self setup];
}
return self;
}

-(void)setup {
UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(cellTapped:)];
[self addGestureRecognizer:gesture];
}

-(IBAction)cellTapped:(UIGestureRecognizer *)recognizer {
CGPoint location = [recognizer locationInView:self];
if(location.x >= 0 && location.x <= 20 && location.y >= 30) {
self.isMailSelected = !self.isMailSelected;
[self setNeedsDisplayInRect:CGRectMake(0, 30, 20, self.frame.size.height)];
//[self setNeedsDisplay];
}
}

• (void)awakeFromNib {
  }

-(void)drawRect:(CGRect)rect {
{
UIImage *statusImage = nil;
switch(self.mailStatus) {
case HPMailDirectDrawCellStatusRead:
statusImage = [UIImage imageNamed:@"bolt"];
break;
case HPMailDirectDrawCellStatusReplied:
statusImage = [UIImage imageNamed:@"second"];
break;
case HPMailDirectDrawCellStatusUnread:
default:
statusImage = [UIImage imageNamed:@"bolt_selected"];
break;
}

    CGRect statusRect = CGRectMake(8, 4, 12, 12);
    [statusImage drawInRect:statusRect];
}

{
    UIImage *attachmentImage = nil;
    if(self.hasAttachment) {
        attachmentImage = [UIImage imageNamed:@"mail_attachment"];
    }

    CGRect statusRect = CGRectMake(8, 20, 12, 12);
    [attachmentImage drawInRect:statusRect];
}

{
    UIImage *selectedImage = [UIImage imageNamed:(self.isMailSelected ? @"mail_selected": @"mail_unselected")];
    CGRect selectedRect = CGRectMake(8, 36, 12, 12);
    [selectedImage drawInRect:selectedRect];
}

float fontSize = 13;
CGFloat width = rect.size.width;
CGFloat remainderWidth = width - 28;
{
    CGFloat emailWidth = remainderWidth - 72;
    UIFont *emailFont=[UIFont boldSystemFontOfSize:fontSize];
    NSDictionary *attrs = @{ NSFontAttributeName: emailFont };

    [self.email drawInRect:CGRectMake(28, 4, emailWidth, 16) withAttributes:attrs];
}

{
    UIFont *stdFont = [UIFont systemFontOfSize:fontSize];
    NSDictionary *attrs = @{ NSFontAttributeName: stdFont };
    [self.subject drawInRect:CGRectMake(28, 24, remainderWidth, 16) withAttributes:attrs];
    [self.snippet drawInRect:CGRectMake(28, 44, remainderWidth, 16) withAttributes:attrs];
}

{
    UIFont *verdana = [UIFont fontWithName:@"Verdana" size:10];
    NSDictionary *attrs = @{ NSFontAttributeName: verdana };
    [self.date drawInRect:CGRectMake(width - 60, 4, 60, 16) withAttributes:attrs];
}

}

• (void)setSelected:(BOOL)selected animated:(BOOL)animated {
  [super setSelected:selected animated:animated];
  //self.isMailSelected = selected;
  //[self setNeedsDisplayInRect:CGRectMake(8, 36, 12, 12)];
  }