iOS开发_条纹背景

Posted 2020-06-08

主控制器的关键代码：

ViewController.m

#import "ViewController.h"

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UITextView *textF;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //1. 创建一行背景图
    CGFloat rowW = self.view.frame.size.width;
    CGFloat rowH = 40;
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(rowW, rowH), NO, 0.0);
    
    //画矩形框
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    [[UIColor whiteColor] set];
    CGContextAddRect(ctx, CGRectMake(0, 0, rowW, rowH));
    CGContextFillPath(ctx);
    
    //2.画线
    [[UIColor blackColor] set];
    CGFloat lineWidth = 1;
    CGContextSetLineWidth(ctx, lineWidth);
    CGFloat dividerX = 10;
    CGFloat dividerY = rowH - lineWidth;
    CGContextMoveToPoint(ctx, dividerX, dividerY);
    CGContextAddLineToPoint(ctx, rowW - dividerX, dividerY);
    CGContextStrokePath(ctx);
    
    //3.取图
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    //4.结束上下文
    UIGraphicsEndImageContext();
    //5.设置背景
    self.textF.backgroundColor =[UIColor colorWithPatternImage:newImage];
    
}

-(void)imagebg{
    UIImage *oldImage = [UIImage imageNamed:@"me"];
    UIGraphicsBeginImageContextWithOptions(self.view.frame.size, NO, 0.0);
    [oldImage drawInRect:self.view.bounds];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    self.view.backgroundColor =[UIColor colorWithPatternImage:newImage];
}

@end