UIImageView Image ContentMode (비율)

//이미지를 중앙 비율을 맞추는것은 contentMode라고 한다

//그에대한 자세한 설명은 http://marines.co.kr/archives/174 

//contentMode Enum

typedef NS_ENUM(NSInteger, UIViewContentMode) {

    UIViewContentModeScaleToFill,

    UIViewContentModeScaleAspectFit,      // contents scaled to fit with fixed aspect. remainder is transparent

    UIViewContentModeScaleAspectFill,     // contents scaled to fill with fixed aspect. some portion of content may be clipped.

    UIViewContentModeRedraw,              // redraw on bounds change (calls -setNeedsDisplay)

    UIViewContentModeCenter,              // contents remain same size. positioned adjusted.

    UIViewContentModeTop,

    UIViewContentModeBottom,

    UIViewContentModeLeft,

    UIViewContentModeRight,

    UIViewContentModeTopLeft,

    UIViewContentModeTopRight,

    UIViewContentModeBottomLeft,

    UIViewContentModeBottomRight,

};

        UIImageView* imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"testImage"]];

        [imageView setContentMode:UIViewContentModeScaleAspectFill];

//이미지뷰의 이미지가 center crop된 상태에서 밖으로 튀어나간 이미지를 안보이게 처리해주는 MasksToBounds

        [[imageView layer] setMasksToBounds:YES];