[英]Objective-C setImage forState:UIControlStateNormal not formatting image properly
我是Objective-c的新手,请耐心等待。 我正在2013年冬季的斯坦福大学“ iPhone / iPad编程”课程中编写一些代码作为练习。基本上,我需要做的是将图像设置为按钮的UIControlStateNormal按钮。 不幸的是,我还不能发布图片以使堆栈溢出,但是当我尝试将按钮的图像设置为UIControlState正常时,按钮的图像到处都是并且比实际按钮大。 对于其他UIControlState选项,带有图像的按钮的行为符合预期。 共有16个按钮。
我不确定自己在做什么错。 我在名为“ updateUI”的方法中在应用程序的ViewController中的for循环中设置了按钮图像。 这是代码:
#import "CardGameViewController.h"
#import "PlayingCardDeck.h"
#import "CardMatchingGame.h"
@interface CardGameViewController ()
@property (weak, nonatomic) IBOutlet UILabel *scoreLabel;
@property (strong, nonatomic) IBOutletCollection(UIButton) NSArray *cardButtons;
@property (weak, nonatomic) IBOutlet UILabel *flipsLabel;
@property (nonatomic) int flipCount;
@property (strong, nonatomic)CardMatchingGame* game;
@property (weak, nonatomic) IBOutlet UILabel *lastFlipLabel;
@property (weak, nonatomic) NSArray *lastFlip;
@property (weak, nonatomic) IBOutlet UISegmentedControl *gameControl;
@end
@implementation CardGameViewController
//lazy instantiation of the game
-(CardMatchingGame *)game
{
if(!_game)
{
_game = [[CardMatchingGame alloc] initWithCardCount:self.cardButtons.count usingDeck:[[PlayingCardDeck alloc]init]];
}
return _game;
}
//set the properties of the card buttons
-(void)setCardButtons:(NSArray *)cardButtons
{
_cardButtons = cardButtons;
[self updateUI];
}
//method to update the UI
-(void)updateUI
{
UIImage* cardback = [UIImage imageNamed:@"cardback.png"];//loads in the pic for the cardback
//go through all the card buttons and update
for(UIButton *cardButton in self.cardButtons)
{
Card* card = [self.game cardAtIndex:[self.cardButtons indexOfObject:cardButton]];//get the card
[cardButton setTitle:card.contents forState:UIControlStateSelected];
[cardButton setTitle:card.contents forState:UIControlStateSelected|UIControlStateDisabled];
cardButton.selected = card.isFaceUp;
cardButton.enabled = !card.isUnplayable;
cardButton.alpha = card.isUnplayable ? 0.2 : 1.0;
if(cardback)
{
[cardButton setImage:cardback forState:UIControlStateNormal];
}
[cardButton setTitle:@"" forState:UIControlStateNormal];
self.scoreLabel.text = [NSString stringWithFormat:@"Score: %d",self.game.score];
}
self.lastFlip = self.game.lastFlip;//get the result of the last flip from the model
[self.gameControl setTitle:@"2-Card \n Game" forSegmentAtIndex:0];
[self.gameControl setTitle:@"3-Card \n Game" forSegmentAtIndex:1];
}
- (IBAction)flipCard:(UIButton *)sender
{
[self.game flipCardAtIndex:[self.cardButtons indexOfObject:sender]];
self.flipCount++;
[self updateUI];
}
//setter for flipCount, update to the UI
-(void)setFlipCount:(int)flipCount
{
_flipCount = flipCount;
self.flipsLabel.text = [NSString stringWithFormat:@"Flips: %d",self.flipCount];
}
//setter for lastFlips, update to the UI
-(void)setLastFlip:(NSArray *)lastFlip
{
_lastFlip = lastFlip;
//append the last flips together to display the status
NSString* cardString = [[NSString alloc]init];
cardString = [self.lastFlip componentsJoinedByString:@" and "];
if(self.lastFlip.count==1 && ![cardString isEqualToString:@""])
{
self.lastFlipLabel.text = [NSString stringWithFormat:@"You just flipped the %@", cardString];
}
else if(self.lastFlip.count!=1 && self.game.lastMatch)
{
self.lastFlipLabel.text = [NSMutableString stringWithFormat:@"You just matched the %@ \n for %d points!",cardString, self.game.lastScore];
}
else if(self.lastFlip.count!=1 && !self.game.lastMatch)
{
self.lastFlipLabel.text = [NSString stringWithFormat:@"Oohh, sorry the %@ don't match. %d points for you!", cardString, self.game.lastScore];
}
}
//reset the game
- (IBAction)resetGame:(UIButton *)sender
{
self.game = [[CardMatchingGame alloc]initWithCardCount:self.cardButtons.count usingDeck:[[PlayingCardDeck alloc]init]];
[self.game reset];
self.lastFlipLabel.text = @"";//reset the text so it's blank
self.flipCount = 0;
[self updateUI];
}
@end
尝试关闭自动布局-在Xcode的故事板视图的右侧面板中。
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