用户可以用手指划过控件上面的若干图像,以此来对电影、软件等项目做出评分。除了简单的滑动,还添加了动画效果。直接上代码,导入到自己项目里就可以直接用
#import "StarSliderA.h"
#define WIDTH [UIScreen mainScreen].bounds.size.width / 20
@interfaceStarSliderA ()
@property (nonatomic, assign) int value;
@end
.m文件
@implementation StarSliderA
- (instancetype)initWithFrame:(CGRect)aFrame{
self = [superinitWithFrame:aFrame];
if (self) {
float offsetCenter = WIDTH;
for (int i = 1; i <= 10; i++) {
UIImageView *imageView = [[UIImageViewalloc] initWithFrame:CGRectMake(0.0f, 0.0f, WIDTH, WIDTH)];
imageView.image = [UIImageimageNamed:@"OFF_ART"];
imageView.center = CGPointMake(offsetCenter, self.intrinsicContentSize.height / 2.0f);
offsetCenter += WIDTH * 1.5f;
[selfaddSubview:imageView];
}
}
self.backgroundColor = [[UIColorblackColor] colorWithAlphaComponent:0.25f];
returnself;
}
- (CGSize)intrinsicContentSize{
returnCGSizeMake(WIDTH * 8.0f, 34.0f);
}
- (void)updateValueAtPoint : (CGPoint)point{
int newValue = 0;
UIImageView *changedView = nil;
for (UIImageView *eachItem in [selfsubviews]) {
if (point.x < eachItem.frame.origin.x) {
eachItem.image = [UIImageimageNamed:@"OFF_ART"];
}
else{
changedView = eachItem;
eachItem.image = [UIImageimageNamed:@"ON_ART"];
newValue++;
}
}
if (self.value != newValue) {
self.value = newValue;
[selfsendActionsForControlEvents:UIControlEventValueChanged];
[UIViewanimateWithDuration:0.15fanimations:^{
changedView.transform = CGAffineTransformMakeScale(1.5f, 1.5f);
} completion:^(BOOL done) {
[UIViewanimateWithDuration:0.1fanimations:^{
changedView.transform = CGAffineTransformIdentity;
}];
}];
}
}
- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event{
CGPoint touchPoint = [touch locationInView:self];
[selfsendActionsForControlEvents:UIControlEventTouchDown];
[selfupdateValueAtPoint:touchPoint];
returnYES;
}
- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event{
CGPoint touchPoint = [touch locationInView:self];
if (CGRectContainsPoint(self.frame, touchPoint)) {
[selfsendActionsForControlEvents:UIControlEventTouchUpInside];
}
else
[selfsendActionsForControlEvents:UIControlEventTouchUpOutside];
[selfupdateValueAtPoint:[touch locationInView:self]];
returnYES;
}
- (void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event{
CGPoint touchPoint = [touch locationInView:self];
if (CGRectContainsPoint(self.bounds, touchPoint)) {
[selfsendActionsForControlEvents:UIControlEventTouchUpInside];
}
else
[selfsendActionsForControlEvents:UIControlEventTouchUpOutside];
}
- (void)cancelTrackingWithEvent:(UIEvent *)event{
[selfsendActionsForControlEvents:UIControlEventTouchCancel];
}
@end
