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1.应用场景：
处理UI控件时，为了好看，比如一些底层背景，需要指定位置设置不同的圆角。
2.实现目标：
利用相关API实现自定义设置圆角值，以左上、右上举例
3.代码说明：
CGFloat radius = 10; // 圆角值大小
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(20,100,200,200)];
if (@available(iOS 11.0, *))
{
// 设置 左上 右上 圆角
view.layer.cornerRadius = radius;
view.layer.maskedCorners = kCALayerMinXMinYCorner | kCALayerMaxXMinYCorner;
}else {
// 设置 左上 右上 圆角
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(radius, radius)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = view.bounds;
maskLayer.path = path.CGPath;
view.layer.mask = maskLayer;
}
注iOS11.0及以上有新的的API处理相应需求，CACornerMask 枚举值说明
typedef NS_OPTIONS (NSUInteger, CACornerMask)
{
kCALayerMinXMinYCorner = 1U << 0, /// 左上角
kCALayerMaxXMinYCorner = 1U << 1, /// 右上角
kCALayerMinXMaxYCorner = 1U << 2, /// 左下角
kCALayerMaxXMaxYCorner = 1U << 3, /// 右下角
};
iOS11.0 之前CACornerMask 枚举值说明
typedef NS_OPTIONS(NSUInteger, UIRectCorner) {
UIRectCornerTopLeft = 1 << 0, /// 左上角
UIRectCornerTopRight = 1 << 1, /// 右上角
UIRectCornerBottomLeft = 1 << 2, /// 左下角
UIRectCornerBottomRight = 1 << 3, /// 右下角
UIRectCornerAllCorners = ~0UL /// 四个角
};
综上，提供一个简单的方法可设置任意位置的圆角值
/**
@brief 设置任意角圆角
@param view 需要设置的控件
@param radius 圆角值
@param positions 位置数组 - @1(左上), @2(右上), @3(左下), @4(右下)
*/
- (void)yp_setCornerRadiusWithView:(UIView *)view radius:(CGFloat)radius positions:(NSArray *)positions {
// view.clipsToBounds = YES; 会触发离屏渲染问题 - 根据实际情况来决定是否放开
if (@available(iOS 11.0, *)) {
// 默认四个角
CACornerMask corners = kCALayerMinXMinYCorner | kCALayerMaxXMinYCorner | kCALayerMinXMaxYCorner | kCALayerMaxXMaxYCorner;
if (positions.count == 1) { // 只设置了一个角
NSInteger positionVal = [positions[0] integerValue];
corners = positionVal == 1 ? kCALayerMinXMinYCorner : positionVal == 2 ? kCALayerMaxXMinYCorner : positionVal == 3 ? kCALayerMinXMaxYCorner : kCALayerMaxXMaxYCorner;
}else if (positions.count == 2) { // 设置了两个角
if ([positions containsObject:@1]) {
if ([positions containsObject:@2]) {// 12
corners = kCALayerMinXMinYCorner | kCALayerMaxXMinYCorner;
}else if ([positions containsObject:@3]) {// 13
corners = kCALayerMinXMinYCorner | kCALayerMinXMaxYCorner;
}else {// 14
corners = kCALayerMinXMinYCorner | kCALayerMaxXMaxYCorner;
}
}else if ([positions containsObject:@2]) {
if ([positions containsObject:@3]) { // 23
corners = kCALayerMaxXMinYCorner | kCALayerMinXMaxYCorner;
}else { // 24
corners = kCALayerMaxXMinYCorner | kCALayerMaxXMaxYCorner;
}
}else {// 34
corners = kCALayerMinXMaxYCorner | kCALayerMaxXMaxYCorner;
}
}else if (positions.count == 3) { // 设置了三个角
if ([positions containsObject:@1] && [positions containsObject:@2]) {
if ([positions containsObject:@3]) { // 123
corners = kCALayerMinXMinYCorner | kCALayerMaxXMinYCorner | kCALayerMinXMaxYCorner;
}else { // 124
corners = kCALayerMinXMinYCorner | kCALayerMaxXMinYCorner | kCALayerMaxXMaxYCorner;
}
}else if ([positions containsObject:@1] && [positions containsObject:@3]) { // 134
corners = kCALayerMinXMinYCorner | kCALayerMinXMaxYCorner | kCALayerMaxXMaxYCorner;
}else {// 234
corners = kCALayerMaxXMinYCorner | kCALayerMinXMaxYCorner | kCALayerMaxXMaxYCorner;
}
}
view.layer.cornerRadius = radius;
view.layer.maskedCorners = corners;
}else {
// 默认四个角
UIRectCorner corners = UIRectCornerTopLeft | UIRectCornerTopRight | UIRectCornerBottomLeft | UIRectCornerBottomRight;
if (positions.count == 1) { // 只设置了一个角
NSInteger positionVal = [positions[0] integerValue];
corners = positionVal == 1 ? UIRectCornerTopLeft : positionVal == 2 ? UIRectCornerTopRight : positionVal == 3 ? UIRectCornerBottomLeft : UIRectCornerBottomRight;
}else if (positions.count == 2) { // 设置了两个角
if ([positions containsObject:@1]) {
if ([positions containsObject:@2]) {// 12
corners = UIRectCornerTopLeft | UIRectCornerTopRight;
}else if ([positions containsObject:@3]) {// 13
corners = UIRectCornerTopLeft | UIRectCornerBottomLeft;
}else {// 14
corners = UIRectCornerTopLeft | UIRectCornerBottomRight;
}
}else if ([positions containsObject:@2]) {
if ([positions containsObject:@3]) { // 23
corners = UIRectCornerTopRight | UIRectCornerBottomLeft;
}else { // 24
corners = UIRectCornerTopRight | UIRectCornerBottomRight;
}
}else {// 34
corners = UIRectCornerBottomLeft | UIRectCornerBottomRight;
}
}else if (positions.count == 3) { // 设置了三个角
if ([positions containsObject:@1] && [positions containsObject:@2]) {
if ([positions containsObject:@3]) { // 123
corners = UIRectCornerTopLeft | UIRectCornerTopRight | UIRectCornerBottomLeft;
}else { // 124
corners = UIRectCornerTopLeft | UIRectCornerTopRight | UIRectCornerBottomRight;
}
}else if ([positions containsObject:@1] && [positions containsObject:@3]) { // 134
corners = UIRectCornerTopLeft | UIRectCornerBottomLeft | UIRectCornerBottomRight;
}else {// 234
corners = UIRectCornerTopRight | UIRectCornerBottomLeft | UIRectCornerBottomRight; }
}
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(radius, radius)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = view.bounds;
maskLayer.path = path.CGPath;
view.layer.mask = maskLayer;
}
}
方法调用
[self yp_setCornerRadiusWithView:self.imgV radius:16 positions:@[@1,@2]];
效果
image.png