UIImage *image = [[UIImage imageNamed:@"lt_ic_my"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
[btn setImage:image forState:UIControlStateNormal] ;
默認情況下九妈,圖像的渲染模式uiimagerenderingmodeautomatic反砌,我們需要的是UIImageRenderingModeAlwaysOriginal
UIViewContentModeScaleAspectFill, ? ? // ?這是整個view會被圖片填滿,圖片比例不變