画一像素线的一个宏
#define SINGLE_LINE_WIDTH (1 / [UIScreen mainScreen].scale)
#define SINGLE_LINE_ADJUST_OFFSET ((1 / [UIScreen mainScreen].scale) / 2)
使用代码:
UIView *view = [[UIView alloc] initWithFrame:CGrect(x - SINGLE_LINE_ADJUST_OFFSET, 0, SINGLE_LINE_WIDTH, 100)];