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我正在尝试将图像保存在相册中。我通过以下代码执行此操作： 

CGSize targetSize =self.view.frame.size;

UIGraphicsBeginImageContext(targetSize);


//UIGraphicsBeginImageContextWithOptions(targetSize, NO, 2.0);

// 也试过了，但没有改善

UIImage* image1 = mkImage1.image;

UIImage* image2 = mkImage2.image;

UIImage* image3 = mkImage3.image;

CGRect rectImage1 = CGRectMake(mkImage1.frame.origin.x , mkImage1.frame.origin.y , mkImage1.frame.size.width , mkImage1.frame.size.height );

CGRect rectImage2 = CGRectMake(mkImage2.frame.origin.x , mkImage2.frame.origin.y , mkImage2.frame.size.width , mkImage2.frame.size.height );

CGRect rectImage3 = CGRectMake(mkImage3.frame.origin.x , mkImage3.frame.origin.y , mkImage3.frame.size.width , mkImage3.frame.size.height );

[image1 drawInRect:rectImage1]; // 崩溃线

[image2 drawInRect:rectImage2];

[image3 drawInRect:rectImage3];


 tempImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(tempImage, nil,nil,nil);

当我尝试绘制 image1 时，我的应用程序崩溃了。但是，如果我评论那条线，所有其他图像都可以正确保存，没有任何问题..

我的日志信息给了我这个信息：

ImageIO`ImageIO_ABGR_TO_ARGB_8Bit：
0x330abc70: 推 {r4, r5, r6, r7, lr}  
0x330abc72: 添加 r7, sp, #12  
0x330abc74: push.w {r8, r10, r11}  
0x330abc78: ldr r1, [r0]  
0x330abc7a: ldr r2, [r0, #12]  
0x330abc7c: cmp.w r2, r1, lsl #2  
0x330abc80：blo 0x330abd06；ImageIO_ABGR_TO_ARGB_8Bit + 150  
0x330abc82: ldr r3, [r0, #24]  
0x330abc84: lsls r2, r1, #2  
0x330abc86: cmp r3, r2  
0x330abc88：blo 0x330abd06；ImageIO_ABGR_TO_ARGB_8Bit + 150  
0x330abc8a: ldr r2, [r0, #4]  
0x330abc8c：cmp r2，#0  
0x330abc8e: beq 0x330abd06 ; ImageIO_ABGR_TO_ARGB_8Bit + 150  
0x330abc90: 比克 lr, r1, #7  
0x330abc94: ldr r3, [r0, #8]  
0x330abc96: ldr.w r12, [r0, #20]  
0x330abc9a: sub.w r4, r1, lr  
0x330abc9e: asrs r5, r1, #3  
0x330abca0: 移动 r6, r12  
0x330abca2: 移动 r8, r3  
0x330abca4：cbz r5，0x330abcbe；ImageIO_ABGR_TO_ARGB_8Bit + 78  
0x330abca6: 移动 r8, r3  
0x330abca8: 移动 r9, r5  
0x330abcaa: 移动 r6, r12  
0x330abcac：vld4.8 {d0，d1，d2，d3}，[r8]！  
0x330abcb0: vswp d0, d2  
0x330abcb4：vst4.8 {d0，d1，d2，d3}，[r6]！// EXC_BAD_ACCESS  
0x330abcb8: subs.w r9, r9, #1  
0x330abcbc: bne 0x330abeac ; slab_dealloc + 132  
0x330abcbe: cmp lr, r1  
0x330abcc0: bge 0x330abcf8 ; ImageIO_ABGR_TO_ARGB_8Bit + 136  
0x330abcc2: add.w r8, r8, #2  
0x330abcc6：添加 r6，#2  
0x330abcc8: 移动 r9, r4  
0x330abcca: ldrb.w r11, [r8]  
0x330abcce: subs.w r9, r9, #1  
0x330abcd2: ldrb r10, [r8, #-2]  
0x330abcd6: strb r11, [r6, #-2]  
0x330abcda: ldrb r11, [r8, #-1]  
0x330abcde: strb r11, [r6, #-1]  

//******************///  
线程 1，队列：com.apple.main-thread  
0x32ac2526 in -[UIImage drawInRect:] ()  
-[MyAppViewController saveToAlbum] 中的 0x00018e32

当我将该图像从 png 转换为 jpg 时，一切正常。但我只想保存 png 格式。

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