One
先总结下最近做项目遇到的一个小问题,创建UIView时,总是有一边会出现一条灰黑线,原因竟是在给view设置frame时的精确度问题,取整下即可;
ceilf(width)
Two
最近在项目里帮朋友简单写了一下这个需求,记录下以后用到方便配置,项目中的我可以放心删了;
#define demoScale CGRectGetWidth([[UIScreen mainScreen] bounds])/375.0
- (void)forDemo{ UIView *contentView = self.view; ///按钮总个数 NSInteger allCount = 16; ///按钮每行总个数 NSInteger elCount = 5; ///左右边距 CGFloat marginLR = 25*demoScale; ///上下边距 CGFloat marginTD = 10*demoScale; ///button左右之间的间隔(item间距) CGFloat lineSpace = 30*demoScale; ///button上下之间的间隔(行间距) CGFloat columnSpace = 20*demoScale; ///button宽 CGFloat btnWidth = (CGRectGetWidth(contentView.bounds) - marginLR*2 - lineSpace*(elCount-1))/elCount; ///button高 CGFloat btnHeight = 50*demoScale; for (int i = 0; i < allCount; i ++) { CGFloat btnX = marginLR + (i%elCount)*(btnWidth + lineSpace); CGFloat btnY = marginTD + (i/elCount)*(btnHeight + columnSpace); NSLog(@"%f,%f",btnX,btnY); UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.backgroundColor = [UIColor redColor]; button.frame = CGRectMake(btnX , btnY, btnWidth, btnHeight); [contentView addSubview:button]; } NSInteger columnNumber = (allCount/elCount); CGFloat contentViewHeiht = marginTD*2 + columnSpace*(columnNumber-1) + columnNumber*btnHeight; }