[控件] 创建出条形间隔效果的背景LineBackgroundView

//
//  ViewController.m
//  LineBackgroundView
//
//  Created by XianMingYou on 15/3/4.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "ViewController.h"
#import "LineBackgroundView.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIColor *color             = [[UIColor blackColor] colorWithAlphaComponent:0.05f];
    LineBackgroundView *bgView = [LineBackgroundView createViewWithFrame:self.view.bounds
                                                               LineWidth:4
                                                                 lineGap:4
                                                               lineColor:color];
    [self.view addSubview:bgView];
}

@end

//
//  LineBackgroundView.h
//  LineBackgroundView
//
//  Created by XianMingYou on 15/3/4.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import <UIKit/UIKit.h>


@interface LineBackgroundView : UIView

@property (nonatomic) CGFloat            lineWidth;
@property (nonatomic) CGFloat            lineGap;
@property (nonatomic, strong) UIColor   *lineColor;

- (void)buildView;
+ (instancetype)createViewWithFrame:(CGRect)frame
                          LineWidth:(CGFloat)width
                            lineGap:(CGFloat)lineGap
                          lineColor:(UIColor *)color;

@end

//
//  LineBackgroundView.m
//  LineBackgroundView
//
//  Created by XianMingYou on 15/3/4.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "LineBackgroundView.h"


// 将度数转换为弧度
#define   RADIAN(degrees)  ((M_PI * (degrees))/ 180.f)


@interface LineBackgroundView ()

@property (nonatomic, strong) UIView *containerView;

@end

@implementation LineBackgroundView

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.layer.masksToBounds = YES;
    }
    return self;
}

- (void)buildView {
    
    if (self.lineGap <= 0 && self.lineWidth <= 0) {
        return;
    }
    
    // 获取长度
    CGFloat width  = self.bounds.size.width;
    CGFloat height = self.bounds.size.height;
    CGFloat containerViewWidth = (width + height) * 0.75;
    
    // 初始化containView
    self.containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0,
                                                                  containerViewWidth,
                                                                  containerViewWidth)];
    self.containerView.layer.borderWidth = 1.f;
    self.containerView.center            = CGPointMake(self.bounds.size.width / 2.f,
                                                       self.bounds.size.height / 2.f);
    
    NSInteger lineViewCount = containerViewWidth / (self.lineGap + self.lineWidth);
    for (int count = 0; count < lineViewCount + 1; count++) {
        UIView *tempView = [[UIView alloc] initWithFrame:CGRectMake(count * (self.lineGap + self.lineWidth),
                                                                    0,
                                                                    self.lineWidth,
                                                                    containerViewWidth)];
        if (self.lineColor) {
            tempView.backgroundColor = self.lineColor;
        } else {
            tempView.backgroundColor = [UIColor blackColor];
        }

        [self.containerView addSubview:tempView];
    }
    
    self.containerView.transform = CGAffineTransformRotate(self.containerView.transform, RADIAN(45));
    [self addSubview:self.containerView];
}

+ (instancetype)createViewWithFrame:(CGRect)frame
                          LineWidth:(CGFloat)width
                            lineGap:(CGFloat)lineGap
                          lineColor:(UIColor *)color {
    LineBackgroundView *bgView = [[LineBackgroundView alloc] initWithFrame:frame];
    bgView.lineWidth           = width;
    bgView.lineGap             = lineGap;
    bgView.lineColor           = color;
    [bgView buildView];

    return bgView;
}

@end