【代碼筆記】將圖片處理成圓的，代碼筆記成圓

【代碼筆記】將圖片處理成圓的，代碼筆記成圓

一，。

二，工程圖。

三，代碼。

ViewController.m

- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.        //初始化介面    [self addView];    }#pragma -mark -functions//初始化介面-(void)addView{    UIImageView *imageView=[[UIImageView alloc] initWithFrame:CGRectMake(20, 50, 100, 100)];    imageView.image=[self changeimagetocilce:[UIImage imageNamed:@"1.png"]];    [self.view addSubview:imageView];}//將圖片處理成圓的-(id)changeimagetocilce:(UIImage*)image{    UIImage *finalImage = nil;    UIGraphicsBeginImageContext(image.size);    {        CGContextRef ctx = UIGraphicsGetCurrentContext();        CGAffineTransform trnsfrm = CGAffineTransformConcat(CGAffineTransformIdentity, CGAffineTransformMakeScale(1.0, -1.0));        trnsfrm = CGAffineTransformConcat(trnsfrm, CGAffineTransformMakeTranslation(0.0, image.size.height));        CGContextConcatCTM(ctx, trnsfrm);        CGContextBeginPath(ctx);        CGContextAddEllipseInRect(ctx, CGRectMake(0.0, 0.0, image.size.width, image.size.height));        CGContextClip(ctx);        CGContextDrawImage(ctx, CGRectMake(0.0, 0.0, image.size.width, image.size.height), image.CGImage);        finalImage = UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();    }        return finalImage;}