以前にIBでAutoLayout制約を使用してみましたが、それらがどのように機能するか、明確にする必要があることなどを理解しています...
しかし、2 つ以上のビューがあると、少し複雑になり、壊れる傾向があります。
それで、同じ問題を抱えていて、代わりに ASCII コードを使用して制約を作成している人物についてのブログを読んだところです。
コンテンツの量に基づいて動的なサイズを持つカスタム UITableViewCell を持つ UITableView があります。自動レイアウトに最適な候補です。
それで、私はそれを行ういくつかの方法を試しましたが、セルにラベルが 1 つだけになるようにコンテンツを削減しました。
ラベルがセルをその周りに境界線で塗りつぶすようにしたいと思います。
つまり、標準サイズはセルの各端から内側を指します。
こんなんやってしまった…
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
_label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
_label.textColor = [UIColor colorWithWhite:0.53 alpha:1.0];
_label.backgroundColor = [UIColor yellowColor];
[self addSubview:_label];
NSDictionary *views = NSDictionaryOfVariableBindings(_label);
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[_label]-|"
options:0
metrics:nil
views:views]];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|-[_label]-|"
options:0
metrics:nil
views:views]];
self.backgroundView = [[UIView alloc] initWithFrame:CGRectZero];
self.backgroundColor = [UIColor clearColor];
}
return self;
}
しかし、セルが表示されると、ラベルは、初期化に使用した CGRect とまったく同じように左上隅にあり、制約に関するこの負荷のエラーが発生します...
Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x1f859e40 h=--& v=--& UILabel:0x1f864a00.midX == + 5>",
"<NSLayoutConstraint:0x1f86a4f0 H:|-(NSSpace(20))-[UILabel:0x1f864a00] (Names: '|':MyCell:0x1f857740 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1f86a4f0 H:|-(NSSpace(20))-[UILabel:0x1f864a00] (Names: '|':MyCell:0x1f857740 )>
Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2013-03-07 11:56:14.841 unasys[13082:907] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x1f85f7b0 V:|-(NSSpace(20))-[UILabel:0x1f864a00] (Names: '|':MyCell:0x1f857740 )>",
"<NSAutoresizingMaskLayoutConstraint:0x1f859ec0 h=--& v=--& UILabel:0x1f864a00.midY == + 5>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1f85f7b0 V:|-(NSSpace(20))-[UILabel:0x1f864a00] (Names: '|':MyCell:0x1f857740 )>
Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2013-03-07 11:56:14.854 unasys[13082:907] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x1f86a540 H:[UILabel:0x1f864a00]-(NSSpace(20))-| (Names: '|':MyCell:0x1f857740 )>",
"<NSAutoresizingMaskLayoutConstraint:0x1f859e40 h=--& v=--& UILabel:0x1f864a00.midX == + 5>",
"<NSAutoresizingMaskLayoutConstraint:0x1f859e80 h=--& v=--& H:[UILabel:0x1f864a00(10)]>",
"<NSAutoresizingMaskLayoutConstraint:0x1ed8e150 h=--& v=--& H:[MyCell:0x1f857740(320)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1f86a540 H:[UILabel:0x1f864a00]-(NSSpace(20))-| (Names: '|':MyCell:0x1f857740 )>
Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2013-03-07 11:56:14.858 unasys[13082:907] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x1eda7260 h=--& v=--& V:[MyCell:0x1f857740(143)]>",
"<NSAutoresizingMaskLayoutConstraint:0x1f859f00 h=--& v=--& V:[UILabel:0x1f864a00(10)]>",
"<NSLayoutConstraint:0x1f85f870 V:[UILabel:0x1f864a00]-(NSSpace(20))-| (Names: '|':MyCell:0x1f857740 )>",
"<NSAutoresizingMaskLayoutConstraint:0x1f859ec0 h=--& v=--& UILabel:0x1f864a00.midY == + 5>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1f85f870 V:[UILabel:0x1f864a00]-(NSSpace(20))-| (Names: '|':MyCell:0x1f857740 )>
これのデバッグをどこから始めればよいかわかりません。制約は絶対に最小限ですが、それでも完全に失敗します。
誰かがこの制約を機能させる方法の正しい方向に私を向けることができますか?