[iOS开发小技巧] UIView单独切圆角，如只要左上右上两个圆角以及输入框提示语中间显示_马拉萨的春天_ios 切圆角

网络 02-07 4502

前言：ios开发中经常遇到一个view上只要两个圆角的情况。 1.切四个圆角的情况

view.layer.cornerRadius = 12; view.layer.masksToBounds = YES;

2.单独切圆角的情况，比如切左上、右上两个圆角

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, SCREEN_WIDTH, 1000) byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(12, 12)]; CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init]; maskLayer.frame = self.bottomView.bounds; maskLayer.path = maskPath.CGPath; self.bottomView.layer.mask = maskLayer;

3. UITextField的提示语中间显示

? ? ? ? _nameTfd = [[UITextField alloc]initWithFrame:CGRectZero];

? ? ? ? _nameTfd.borderStyle = UITextBorderStyleNone;

? ? ? ? NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc]init];

? ? ? ? style.alignment = NSTextAlignmentCenter;

? ? ? ? NSMutableAttributedString *attribute = [[NSMutableAttributedString alloc]initWithString:@"请输入分类名称" attributes:@{NSParagraphStyleAttributeName:style}];

? ? ? ? _nameTfd.attributedPlaceholder = attribute;

? ? ? ? _nameTfd.backgroundColor = kRGBA(247, 248, 251, 1);

? ? ? ? _nameTfd.layer.masksToBounds = YES;

? ? ? ? _nameTfd.layer.cornerRadius = 21;

? ? ? ? _nameTfd.delegate = self;