一辺ごとに枠線の表示指定が可能なUIViewを作る

// 枠強調オプション

typedef NS_OPTIONS(NSUInteger, eBorderEmphasisOption)

{

BorderEmphasisOption_None = 0,

BorderEmphasisOption_Top = 1 << 0,

BorderEmphasisOption_Bottom = 1 << 1,

BorderEmphasisOption_Left = 1 << 2,

BorderEmphasisOption_Right = 1 << 3,

BorderEmphasisOption_All = NSUIntegerMax

};

@interface BorderExView : UIView

@property (nonatomic) eBorderEmphasisOption borderEmphasis;

@property (nonatomic, strong) UIColor* borderColor;

@property (nonatomic) float borderWidth;

@end

@interface BorderExView ()

{

eBorderEmphasisOption _borderEmphasis;

}

@end

@implementation BorderExView

@synthesize borderColor = _borderColor;

@synthesize borderWidth = _borderWidth;

@dynamic borderEmphasis;

- (eBorderEmphasisOption)borderEmphasis

{

return _borderEmphasis;

}

- (void)setBorderEmphasis:(eBorderEmphasisOption)borderEmphasis

{

_borderEmphasis = borderEmphasis;

[self setNeedsDisplay];

}

- (id)initWithFrame:(CGRect)frame

{

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

_borderEmphasis = BorderEmphasisOption_None;

self.borderColor = [UIColor blackColor];

self.borderWidth = 1.0;

}

return self;

}

- (void)drawRect:(CGRect)rect

{

CGContextRef ctx = UIGraphicsGetCurrentContext();

CGContextSetLineWidth(ctx, self.borderWidth);

CGContextSetStrokeColorWithColor(ctx, self.borderColor.CGColor);

if (self.borderEmphasis & BorderEmphasisOption_Top) {

CGContextMoveToPoint(ctx, 0, 0);

CGContextAddLineToPoint(ctx, self.frame.size.width, 0);

CGContextStrokePath(ctx);

}

if (self.borderEmphasis & BorderEmphasisOption_Bottom) {

CGContextMoveToPoint(ctx, 0, self.frame.size.height);

CGContextAddLineToPoint(ctx, self.frame.size.width, self.frame.size.height);

CGContextStrokePath(ctx);

}

if (self.borderEmphasis & BorderEmphasisOption_Left) {

CGContextMoveToPoint(ctx, 0, 0);

CGContextAddLineToPoint(ctx, 0, self.frame.size.height);

CGContextStrokePath(ctx);

}

if (self.borderEmphasis & BorderEmphasisOption_Right) {

CGContextMoveToPoint(ctx, self.frame.size.width, 0);

CGContextAddLineToPoint(ctx, self.frame.size.width, self.frame.size.height);

CGContextStrokePath(ctx);

}

}

@end

BorderExView* view = [[BorderExView alloc] initWithFrame:CGRectMake(50, 50, 100, 100)];

[self.view addSubview:view];

view.backgroundColor = [UIColor yellowColor];

view.borderColor = [UIColor grayColor];

view.borderWidth = 5.0;

view.borderEmphasis = BorderEmphasisOption_Left | BorderEmphasisOption_Top;