pengyingh

摘要： http://www.cnblogs.com/delonchen/archive/2011/06/12/CGContextDrawImage.html这个函数绘制图片，但坐标系统原点在左上角，y方向向下的（坐标系A），但在Quartz中坐标系原点在左下角，y方向向上的(坐标系B)。图片绘制也是颠倒的。要达到预想的效果必须变换坐标系，代码如下：void drawImage(CGContextRef context, CGImageRef image , CGRect rect){ CGContextSaveGState(context); CGContextTranslateCTM(co... 阅读全文

摘要： http://stackoverflow.com/questions/1344767/how-to-draw-a-shape-on-top-of-a-uiimage-while-respecting-the-images-alpha-maskI need a UIImageView that can draw itself in color or b/w according to a flag: BOOL isGrey;I'm trying to do it by drawing a black rectangle on top of the original image with t 阅读全文

摘要： NSNumberFormatter *formatter=[[NSNumberFormatter alloc]init]; [formatter setGroupingSeparator:@","]; [formatter setGroupingSize:3]; [formatter setUsesGroupingSeparator:YES]; NSNumber *num= [NSNumber numberWithInt:144343]; NSString *str = [formatter stringFromNumber:num]; 结果：144,343 阅读全文