說實話我花了不少時間才真正理解setContentCompressionResistancePriority和setContentHuggingPriority的用法。
[label1 setContentCompressionResistancePriority:758 forAxis:(UILayoutConstraintAxisHorizontal)];
[label1 setContentHuggingPriority:300 forAxis:(UILayoutConstraintAxisHorizontal)];
setContentCompressionResistancePriority(抗壓縮)，這個值越低，就會在寬度不夠的情況下，被壓縮。常見的視圖默認給的值是UILayoutPriorityDefaultHigh = 750。若是多個視圖是默認值，會被系統認爲更早被addSubview的視圖該值更小！
setContentHuggingPriority(抗拉伸)，這個值越低，就會在寬度多餘的情況下，被拉伸。常見的視圖默認給的值是UILayoutPriorityDefaultLow = 250。若是多個視圖是默認值，會被系統認爲更早被addSubview的值更小！
下面舉個栗子驗證下：
import "CompressionAndHuggingViewController.h"
#import <Masonry.h>
@interface CompressionAndHuggingViewController ()
@property (nonatomic, weak) UILabel * label1;
@property (nonatomic, weak) UILabel * label2;
@property (nonatomic, weak) UILabel * label3;
@end
@implementation CompressionAndHuggingViewController
- (UIStatusBarStyle)preferredStatusBarStyle{
return UIStatusBarStyleLightContent;
}
-(void)viewDidLoad{
[super viewDidLoad];
[self setUI1];
self.view.backgroundColor = [UIColor whiteColor];
_label1.text = @"張發給發給";
_label2.text = @"髒了發浪浪浪蘭陵古娜拉你敢來給你";
_label3.text = @"2019.12.22";
}
- (void)setUI1{
UILabel *label1 = [[UILabel alloc] init];
label1.textColor = @"#212121".toColor;
label1.font = [UIFont systemFontOfSize:16];
[self.view addSubview:label1];
_label1 = label1;
[label1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.offset(100);
make.left.offset(10);
}];
[label1 setContentCompressionResistancePriority:758 forAxis:(UILayoutConstraintAxisHorizontal)];
[label1 setContentHuggingPriority:300 forAxis:(UILayoutConstraintAxisHorizontal)];
UILabel *label2 = [[UILabel alloc] init];
label2.textColor = @"#757575".toColor;
label2.font = [UIFont systemFontOfSize:16];
[self.view addSubview:label2];
_label2 = label2;
[label2 mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(label1.mas_right).offset(8);
make.width.greaterThanOrEqualTo(@80).priority(759);
make.top.equalTo(label1.mas_top);
}];
UILabel *label3 = [[UILabel alloc] init];
label3.textColor = @"#757575".toColor;
label3.textAlignment = NSTextAlignmentRight;
label3.font = [UIFont systemFontOfSize:16];
[self.view addSubview:label3];
_label3 = label3;
[label3 mas_makeConstraints:^(MASConstraintMaker *make) {
make.right.offset(-16);
make.left.equalTo(label2.mas_right).offset(2);
make.top.equalTo(label1.mas_top);
}];
[label3 setContentCompressionResistancePriority:760 forAxis:(UILayoutConstraintAxisHorizontal)];
}
@end
